TLS: Fix test failures on recent Debian/Ubuntu.
TLS: Fix test failures on recent Debian/Ubuntu.

Seems like on some systems choosing specific TLS v1/v1.1 versions no
longer works as expected. Test is reduced for v1.2 now which is still
good enough to test the mechansim, and matters most anyway.

JackieXie168/redis,JackieXie168/redis,JackieXie168/redis,JackieXie168/redis