libcore.java.security: delete KeyStoreTest

KeyStoreTest moved to cts/ under android.keystore.cts
in 4d85f5290a823f3b326be568f6c962f9b155ea4a

(cherry picked from commit 721592707010ba70ee9efa9fa4c0fb6d4ea3afd9)

Bug: 27806958
Bug: 27810271
Change-Id: I33e666440c8ec3714ceb550188cd38f575112d00
1 file changed