upr client: Wait for 100ms before retry during tmpfail

During rebalance, stream request for certain partitions can
get tmpfail response. Retrying without any wait time results
in log files getting flooded with retry log messages.

Change-Id: Iee57f4f80b707826fd562be5e253070a559f47e3
Reviewed-on: http://review.couchbase.org/39405
Reviewed-by: Sarath Lakshman <sarath@couchbase.com>
Reviewed-by: Volker Mische <volker.mische@gmail.com>
Tested-by: buildbot <build@couchbase.com>