initscripts: Fix log & pidfile name.

At startup, these would be S98socorro-*.pid and log, and if you did
'service socorro-foo start' it would just be socorro-*.pid. This unifies
it by stripping S?? prefixes.
initscripts: Hardcode the progname instead.
Merge pull request #2137 from jorgenpt/initscript-names

initscripts: Fix log & pidfile name.