Changed start_p4[p,broker]() functions to check for pids rather
than use a 'p4 info' check, to avoid dependency on 'p4d' being
up.
Style normalization: The formal bash 'function' declaration is now
used for all function definitions.
Removed obsolete logic to follow up a systemd stop for p4d with a
SysV init stop call. That had been done to woarkound systemd status
reliability issues, but is no longer needed due to robustness
improvements in systemd handling in this release, and also changes
to disallow SysV init scripts from being used when systemd is in
play.