LU-7185 ldlm: Restore connect flags on failure

LU-7185 ldlm: Restore connect flags on failure

Restore connect flags on failure of ptlrpc_connect_import()
to prevent an LBUG due to flags mismatch.

Signed-off-by: Jeremy Filizetti <jeremy.filizetti@gmail.com>
Change-Id: I9149c8d2f512c1f920b3bdfa8f3435b03dc72ab2
Reviewed-on: http://review.whamcloud.com/16950
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Reviewed-by: Sebastien Buisson <sebastien.buisson@bull.net>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>