Windows: Remove fallback from GetCaps to GetTime

Windows: Remove fallback from GetCaps to GetTime

If the file server responds to RXAFS_GetCapabilities with
RXGEN_OPCODE the server is up and there is no need to fallback to
RXAFS_GetTime.  Remove the code that performs the extra work.

Reviewed-on: http://gerrit.openafs.org/3419
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit 166de9ffa29244f38f1d2c1e8b0fa9a9fd1802b5)

Change-Id: I2d7424e891d728b4b0589989c8a58f15594db412
Reviewed-on: http://gerrit.openafs.org/3783
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>