Fix LCB_RETRY_CMDS_ALL constant

This constant should indicate "All" commands should be retried, and
needs an additional bit value (i.e. including GET and SAFE). This
includes the bit pattern of the older variant, so this will not break
older code which happens to use this.

Change-Id: Ie8f0077e7dc8b03177a64d946df85598ed6a71f0
Reviewed-on: http://review.couchbase.org/43806
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>