Minor bug fix for shell scripts in sandbox directory

(#897)
deploy.sh:    extra x in "$1"x == "master_slave". Also add `-h` option which is common in linux shell scripts.
start_bfs.sh: bfs can not work well with raft mode enabled with only sleeping 5 seconds, add 'sleep 30' when using raft mode.
clear.sh:     redirect the error log message like `process not found` to `/dev/null`. It does no good but confuses the users.
start_bfs.sh: `cd -` print the working directory which is useless. Add the server starting message like `start nameserver0 with pid xxx`

sandbox/clear.sh

@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
 
-killall -9 nameserver
-killall -9 chunkserver
-killall -9 bfs_client
+killall -9 nameserver  > /dev/null 2>&1
+killall -9 chunkserver > /dev/null 2>&1
+killall -9 bfs_client  > /dev/null 2>&1
 
 rm -rf nameserver* chunkserver*
 rm -rf master* slave*

sandbox/deploy.sh

@@ -10,8 +10,16 @@ if [ "$1"x = "x" ]; then
     ns_num=1;
 elif [ "$1x" == "raftx" ]; then
     ns_num=3
-elif [ "$1x" == "master_slave" ]; then
+elif [ "$1" == "master_slave" ]; then
     ns_num=2
+elif [ "$1" == "-h" ]; then
+    echo "Usage:"
+    echo "    $0 [mode = none | master_slave | raft | -h]"
+    echo "        none:         one nameserver, default mode."
+    echo "        master_slave: two nameservers, one is master and the other is slave."
+    echo "        raft:         three nameservers, master server is choosen by inbuilt raft protocol."
+    echo "        -h:           show this usage."
+    exit 0
 fi
 
 echo '--default_replica_num=3' >> bfs.flag

sandbox/small_test.sh

@@ -21,6 +21,9 @@ fi
 
 
 sleep 5
+if [ "$1"x == "raft"x ]; then
+    sleep 30
+fi
 
 # Test sl
 ./bfs_client ls /
@@ -110,6 +113,9 @@ do
 done;
 
 sleep 10
+if [ "$1"x == "raft"x ]; then
+    sleep 30
+fi
 ./bfs_client get /bin/bfs_client ./binary
 rm -rf ./binary
 

sandbox/start_bfs.sh

@@ -12,25 +12,29 @@ do
     cd nameserver$i;
     ./bin/nameserver --node_index=$i 1>nlog 2>&1 &
     echo $! > pid
-    cd -
+    echo "start nameserver$i with pid `cat pid`"
+    cd - > /dev/null
 done;
 
 if [ "$1"x == "master_slave"x ]; then
     cd nameserver0;
     ./bin/nameserver --master_slave_role=slave --node_index=0 1>nlog 2>&1 &
     echo $! > pid
-    cd -
+    echo "start slave nameserver0 with pid `cat pid`"
+    cd - > /dev/null
     sleep 1
     cd nameserver1;
     ./bin/nameserver --master_slave_role=master --node_index=1 1>nlog 2>&1 &
     echo $! > pid
-    cd -
+    echo "start master nameserver1 with pid `cat pid`"
+    cd - > /dev/null
 fi
 
 for i in `seq 0 3`;
 do
     cd chunkserver$i;
     ./bin/chunkserver --chunkserver_port=802$i 1>clog1 2>&1 &
     echo $! > pid
-    cd -
+    echo "start chunkserver$i with pid `cat pid` at port 802$i"
+    cd - > /dev/null
 done