gtest: Rename deprecated ...TEST_CASE API

[yannik-dittmar]

With version 1.10.0 gtest renames its ...TEST_CASE methods to ...TEST_SUITE.
(https://github.com/google/googletest/releases/tag/release-1.10.0)

This commit adapts the new naming, it replaces all INSTANTIATE_TEST_CASE_P in favor of INSTANTIATE_TEST_SUITE_P and uses the find_package methode in the CMake file to find the gtest lib on the system.

[yannik-dittmar]

All tests are passing.

$ ctest . --output-on-failure
Test project /src/build
      Start  1: OpenSSLTest
 1/31 Test  #1: OpenSSLTest ......................   Passed    0.00 sec
      Start  2: Asn1TimeTests
 2/31 Test  #2: Asn1TimeTests ....................   Passed    0.00 sec
      Start  3: HashTests
 3/31 Test  #3: HashTests ........................   Passed    0.00 sec
      Start  4: UtilTests
 4/31 Test  #4: UtilTests ........................   Passed    0.00 sec
      Start  5: KeyTest
 5/31 Test  #5: KeyTest ..........................   Passed    5.87 sec
      Start  6: CsrTests
 6/31 Test  #6: CsrTests .........................   Passed    0.16 sec
      Start  7: BioTests
 7/31 Test  #7: BioTests .........................   Passed    0.00 sec
      Start  8: DistinguishedNameTests
 8/31 Test  #8: DistinguishedNameTests ...........   Passed    0.00 sec
      Start  9: X509Tests
 9/31 Test  #9: X509Tests ........................   Passed    0.07 sec
      Start 10: CRLTests
10/31 Test #10: CRLTests .........................   Passed    0.01 sec
      Start 11: VerificationTests
11/31 Test #11: VerificationTests ................   Passed    0.18 sec
      Start 12: CATests
12/31 Test #12: CATests ..........................   Passed    5.09 sec
      Start 13: SignatureTests
13/31 Test #13: SignatureTests ...................   Passed    0.15 sec
      Start 14: AsymEncryptionTests
14/31 Test #14: AsymEncryptionTests ..............   Passed    0.01 sec
      Start 15: RSAPaddingModeTests
15/31 Test #15: RSAPaddingModeTests ..............   Passed    0.07 sec
      Start 16: SymmetricCipherTest
16/31 Test #16: SymmetricCipherTest ..............   Passed    0.02 sec
      Start 17: SymmetricCipherMemoryModelTest
17/31 Test #17: SymmetricCipherMemoryModelTest ...   Passed    0.00 sec
      Start 18: KdfSchemesTest
18/31 Test #18: KdfSchemesTest ...................   Passed    0.01 sec
      Start 19: HMacSchemesTest
19/31 Test #19: HMacSchemesTest ..................   Passed    0.00 sec
      Start 20: CMacSchemesTest
20/31 Test #20: CMacSchemesTest ..................   Passed    0.00 sec
      Start 21: EciesSchemesTest
21/31 Test #21: EciesSchemesTest .................   Passed    0.02 sec
      Start 22: aesExample
22/31 Test #22: aesExample .......................   Passed    0.00 sec
      Start 23: caCsrExample
23/31 Test #23: caCsrExample .....................   Passed    0.01 sec
      Start 24: eciesExample
24/31 Test #24: eciesExample .....................   Passed    0.01 sec
      Start 25: hashExample
25/31 Test #25: hashExample ......................   Passed    0.00 sec
      Start 26: kdfExample
26/31 Test #26: kdfExample .......................   Passed    0.01 sec
      Start 27: keyExample
27/31 Test #27: keyExample .......................   Passed    0.11 sec
      Start 28: macExample
28/31 Test #28: macExample .......................   Passed    0.00 sec
      Start 29: rsaExample
29/31 Test #29: rsaExample .......................   Passed    0.19 sec
      Start 30: sigExample
30/31 Test #30: sigExample .......................   Passed    0.16 sec
      Start 31: certValidation
31/31 Test #31: certValidation ...................   Passed    0.00 sec

100% tests passed, 0 tests failed out of 31