ovs_client: remove debug logging

Debug logging previously addeded to ovs_client.c introduces
additional decisions which, coupled with the logging,
negatively impact performance. The degraded performance is
particularly evident in the IVSHMEM VM-VM test case.

Remove these logs to boost performance to its previous levels.

Change-Id: I8f5a8aff85ca86085c5e45735a28ae4a4c524863
Signed-off-by: Mark Kavanagh <mark.b.kavanagh@intel.com>
Reviewed-By: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-By: Kevin Traynor <kevin.traynor@intel.com>