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SSLContextImpl is the HarmonyJSSE provider's SSLContext SPI.
OpenSSLContextImpl is the AndroidOpenSSL provider's SSLContext SPI.
This CL adjusts the class hierarchy to match.

This is achieved by:
1. copying all of the functionality from SSLContextImpl into
  OpenSSLContextImpl, and
2. removing from SSLContextImpl the functionality used only by the
  default instance of AndroidOpenSSL provider's SSLContext.

Change-Id: I9e380be04e6a9a1660c3e6c0738ca026c171f4bd