Log babysitter pid and shutdown request.
Log babysitter pid and shutdown request.

Note that cluster_run starts babysitters via
child_erlang:start_child/1 which also prints this information, so in
such case it will be duplicated.

Change-Id: I6078b19ffc6459336fca0303e0d6cd344ec37885
Reviewed-on: http://review.couchbase.org/43495
Tested-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

membase/ns_server,nimishzynga/ns_server,nimishzynga/ns_server,ceejatec/ns_server,ceejatec/ns_server,membase/ns_server,mschoch/ns_server,mschoch/ns_server,ceejatec/ns_server,nimishzynga/ns_server,mschoch/ns_server,ceejatec/ns_server,mschoch/ns_server,ceejatec/ns_server,nimishzynga/ns_server,mschoch/ns_server,membase/ns_server,nimishzynga/ns_server,ceejatec/ns_server,nimishzynga/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,mschoch/ns_server