Add CTS test for client certificate chains

Add tests to excercise new WifiEnterpriseConfig methods, including
setClientKeyEntryWithCertificateChain, and the new getters related
to it.

Bug: 34688653
Test: This is a test
Change-Id: I183166f5864c5ec77eb8590e2e0f521bbc7a39e7
1 file changed
tree: f9eb0860b251ca2ed2174e7e237c97b57591098f
  1. tests/