Clarify which methods return connected sockets

Some methods in SSLCertificateSocketFactory return connected sockets
and some return unconnected sockets.  Be explicit in each method's
documentation about whether it returns a connected or unconnected
socket.

Bug: 37618511
Test: cts -m CtsNetTestCases -t android.net.cts.SSLCertificateSocketFactoryTest
Change-Id: Ia9c6c8bec15a2d3fbd0d86f8accff13627c79565
1 file changed