Add scylla serialization tests

[illia-li]

Changes:

1. Added serialization tests for cql simple types. The counter type is not included.
2. Fixed timeuuid. Marshaling zeroUUID returns make([]byte,16) before, now returns make([]byte,0)
3. Added values test cases for uuid, timeuuid, inet, float, double cql types into unit tests.

Here are the contents of the tables selected by cqlsh:
test_ascii:

test_id | test_col
---------+-------------
     val | test string
     nil |        null
   zeros | 

test_bigint:

 test_id | test_col
---------+----------------------
     min | -9223372036854775808
     nil |                 null
   zeros |                    0
      +1 |                    1
      -1 |                   -1
     max |  9223372036854775807

test_blob:

 test_id | test_col
---------+--------------------------
     val | 0x7465737420737472696e67
     nil |                     null
   zeros |                       0x

test_boolean:

 test_id | test_col
---------+----------
     min |    False
     nil |     null
     max |     True

test_date:

 test_id | test_col
---------+-------------
     nil |        null
   zeros | -2147483648
     mid |  1970-01-01
     max |  2147483647
       1 | -2147483647

test_decimal:

 test_id | test_col
---------+------------------------------
     min | -9.223372036854775808E+32786
     nil |                         null
   zeros |                            0
     max |  9.223372036854775807E-32749

test_double:

 test_id      | test_col
--------------+--------------
          min | -1.7977e+308
          nil |         null
        zeros |            0
          max |  1.7977e+308
 smallest_pos |  4.9407e-324
 smallest_neg | -4.9407e-324

test_duration:

 test_id | test_col
---------+--------------------------------------------------------
     min | -178956970y8mo2147483648d2562047h47m16s854ms775us808ns
     nil |                                                   null
   zeros |                                                       
      +1 |                                               1mo1d1ns
      -1 |                                              -1mo1d1ns
     max |  178956970y7mo2147483647d2562047h47m16s854ms775us807ns

test_float:

 test_id      | test_col
--------------+-------------
          min | -3.4028e+38
          nil |        null
        zeros |           0
          max |  3.4028e+38
 smallest_pos |  1.4013e-45
 smallest_neg | -1.4013e-45

test_inet:

 test_id | test_col
---------+-----------------------------------------
 v4zeros |                                 0.0.0.0
     nil |                                    null
   v4max |                         255.255.255.255
   v6max | ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
 v6zeros |                                      ::

test_int:

 test_id | test_col
---------+-------------
     min | -2147483648
     nil |        null
   zeros |           0
      +1 |           1
      -1 |          -1
     max |  2147483647

test_smallint:

 test_id | test_col
---------+----------
     min |   -32768
     nil |     null
   zeros |        0
      +1 |        1
      -1 |       -1
     max |    32767

test_text:

 test_id | test_col
---------+-------------
     val | test string
     nil |        null
   zeros |            

test_time:

 test_id | test_col
---------+--------------------
     nil |               null
   zeros | 00:00:00.000000000
     max | 23:59:59.999999999

test_timestamp:

 test_id | test_col
---------+---------------------------------
     min |            -9223372036854775808
     nil |                            null
   zeros | 1970-01-01 00:00:00.000000+0000
      +1 | 1970-01-01 00:00:00.001000+0000
      -1 | 1969-12-31 23:59:59.999000+0000
     max |             9223372036854775807

test_timeuuid:

 test_id | test_col
---------+--------------------------------------
     val | e939f52a-d690-11ef-9cd2-0242ac120002
     nil |                                 null
   zeros | 00000000-0000-1000-0000-000000000000
     max | ffffffff-ffff-1fff-ffff-ffffffffffff

test_tinyint:

 test_id | test_col
---------+----------
     min |     -128
     nil |     null
   zeros |        0
      +1 |        1
      -1 |       -1
     max |      127

test_uuid:

 test_id | test_col
---------+--------------------------------------
     val | e939f52a-d690-11ef-9cd2-0242ac120002
     nil |                                 null
   zeros | 00000000-0000-0000-0000-000000000000
     max | ffffffff-ffff-ffff-ffff-ffffffffffff

test_varchar:

 test_id | test_col
---------+-------------
     val | test string
     nil |        null
   zeros |          

test_varint:

 test_id | test_col
---------+----------------------
     min | -9223372036854775808
     nil |                 null
   zeros |                    0
      +1 |                    1
      -1 |                   -1
     max |  9223372036854775807

[dkropachev]

@illia-li , it should not be cassandra tests, it should be integration data type tests.

[dkropachev]

@illia-li , also please run this suite, then take cqlsh and run select * from <case_table> and attache results here.
To make sure python-driver provides same results.

[illia-li]

@illia-li , also please run this suite, then take cqlsh and run select * from <case_table> and attache results here. To make sure python-driver provides same results.

I added equaling tables content which is get by cqlsh.