RFR(M): JDK-8132214: [TESTBUG] Create basic shared strings test for CDS archive

[Mikhailo Seledtsov]

Please review an addition of a new test for Shared Strings in CDS archive.

     JBS:            https://bugs.openjdk.java.net/browse/JDK-8132214
     WebRev:     http://cr.openjdk.java.net/~mseledtsov/8132214.00/
     Testing:     Ran CDS tests including this newly written test via
                         automated multi-platform testing on standard 
platforms

Thank you,
Misha