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Fix Memcached key decode

Description

Fix Memcached key decode

Flow had a key: flowdb:flow_ref:wiki:by-source:v3:Parser\'s_"broken"_+_(page)_&_grill:testwiki:1:4.7
the '+' in there was not being encoded (it only does /[\x00-\x20\x25\x7f]+/)
but coming back, it was decoded into ' '.
getMulti() shows a key=>value array or results. Since key was different,
we couldn't find what we had requested.

Bug: T110326
Change-Id: Ia92edd73d0eb7fe0d35e38e7e7af8174fb85cbcc