radosgw: increase nofiles ulimit on sysvinit machines

Clusters with many OSDs require a higher nofiles ulimit than the RHEL default. Increase it.

Tested-by: Dan van der Ster <daniel.vanderster@cern.ch>
Signed-off-by: Dan van der Ster <daniel.vanderster@cern.ch>
vstart.sh: add --memstore option

for setting memstore backed osds

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
Merge pull request #935 from ceph/wip-vstart-memstore

vstart.sh: add --memstore option
Merge pull request #934 from cernceph/wip-rgw-ulimit

radosgw: increase nofiles ulimit on sysvinit machines
Merge git://github.com/ceph/ceph