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This enables TLS-PSK cipher suites by default iff SSLContext is
initialized with a PSKKeyManager. For consistency, X.509 based
cipher suites are no longer enabled by default at all times -- they
are now only enabled by default iff SSLContext is initialized with a
X509KeyManager or a X509TrustManager.

When both X.509 and PSK cipher suites need to be enabled, PSK cipher
suites are given higher priority in the resulting list of cipher
suites. This is based on the assumption that in most cases users of
TLS/SSL who enable TLS-PSK would prefer TLS-PSK to be used when the
peer supports TLS-PSK.

Bug: 15073623
Change-Id: I8e2bc3e7a1ea8a986e468973b6bad19dc6b7bc3c