libpcp_web: minor extension to Redis version check logic
libpcp_web: minor extension to Redis version check logic

Tweaks the INFO response parser so that comparisons on redis_version
always start at the end of a line.  Also ensure the type of the local
variable used to index the string matches the string length variable
type (size_t).

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp