This commit touches many of our tests but the changes are actually
few. Setting xpack.security.ssl.diagnose.trust to true
wraps SunJSSE TrustManager with our own DiagnosticTrustManager and
this is not allowed when SunJSSE is in FIPS mode. So when we
use SunJSSE in FIPS mode ( currently only when running our tests
with FIPS mode on for Java 8 runtime ), we need to make sure that
the Diagnostic TrustManager is not enabled. This change
ensures that whenever a new SSLService is to be created, we
explicitly pass xpack.security.ssl.diagnose.trust=false in the
settings used for the SSLService, when we run in FIPS mode in
Java 8.

…-7.x

…-7.x