LP#1652382: normalization of memcache keys in C code

LP#1652382: normalization of memcache keys in C code

Memcache does not allow spaces in keys, so here we will actively strip them
from any key we get from a caller.  Some callers are not very proactive about
sending clean keys, and this patch prevents issues that can poison C-based
OpenSRF service backends.

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Kathy Lussier <klussier@masslnc.org>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>
Signed-off-by: Jeff Davis <jdavis@sitka.bclibraries.ca>