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This makes TLS/SSL primitives operate as expected when no
X509TrustManager or X509KeyManager is provided. Instead of blowing up
with KeyManagementException or NullPointerException (or similar) when
X509TrustManager or X509KeyManager is not provided, this CL makes
SSLContext.init accept such setup, and makes SSLSocket and SSLEngine
reject certificate chains, select no private keys/aliases, and accept
no certificate issuers.

Bug: 13563574
Change-Id: I8de58377a09025258357dd4da9f6cb1b6f2dab80