redis: fix service redis-server restart not working under sysvinit

Under sysvinit when trying to restart redis-server using
service redis-server restart two calls are made to start-stop-daemon, first
with the --stop argument and then with --start argument consecutively.

Because the process doesn't immediately terminate when start-stop-daemon
--stop is called, the next call to start-stop-daemon --start finds the
process still running and does not attempt to start another one.

This leads to only a stop of the redis-server process when a restart is
requested. This behavior affects all redis versions using sysvinit only.

This can be fixed by using the --retry <timeout/schedule> argument with
start-stop-daemon --stop in order for the call to block until the process
terminates so that start-stop-daemon --start will attempt to start a new
process.

Unfortunately the --retry argument works only in the implementation of
start-stop-daemon provided by dpkg package and is ignored in the
implementation provided by busybox package.

A repeated check if the process is still running and another try with
another signal after a timeout will effectively simulate a stop with
--retry=TERM/5/KILL/5 schedule.

Signed-off-by: Stefan Ghinea <stefan.ghinea@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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