restart_osd_daemon.sh.j2 - Reset RETRIES between calls of check_pgs

restart_osd_daemon.sh.j2 - Reset RETRIES between calls of check_pgs

Previously RETRIES was set (by default to 40) once at the start of the
script; this meant that it would only ever wait for up to 40 lots of
30s across *all* the OSDs on a host before bombing out. In fact, we
want to be prepared to wait for the same amount of time after each OSD
restart for the clusters' pgs to be happy again before continuing.

Closes: #3154
Signed-off-by: Matthew Vernon <mv3@sanger.ac.uk>