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SSLSession should be wrapped so that cached sessions might have the
functionality that ExtendedSSLSession offers. This also made the
SSLSessionTest fail because the pre-cached instance would be
ExtendedSSLSession and the post-cached session would be a regular
SSLSession.

To keep compatibility with older versions of the platform, it was
impossible to directly switch OpenSSLSessionImpl over to
ExtendedSSLSession. So the use of a delegate in the case when the
platform does have ExtendedSSLSession was required. Since older platform
versions still use OpenSSLSessionImpl that extends SSLSession, we just
directly inflate the serialized sessions to that.

The SSLSessionTest was changed to accomodate the delegate scheme since
SSLSession does not have an equals method, the tests for SSLSessionTest
were directly comparing object instance equality which fails when the
sessions are wrapped in a delegate like this.

(cherry picked from commit 710c0817)

Bug: 27123298
Change-Id: Iefbea03a72dbcc76ae0b439cfdcecd817926b7d0