Common: changed civetweb line in rgw section(conf)

Common: changed civetweb line in rgw section(conf)

Resolves issue: Multiple RGW Ceph.conf Issue #1258

In multi-RGW setup, in ceph.conf the RGW sections
contain identical bind IP in civetweb line. So this
modification fixes that issue and puts the right IP
for each RGW.

Signed-off-by: SirishaGuduru SGuduru@walmartlabs.com
Modified ceph-defaults and ran generate_group_vars_sample.sh

group_vars/osds.yml.sample and group_vars/rhcs.yml.sample are
not part of the changes. But they got modified when
generate_group_vars_sample.sh is ran to generate group_vars/
all.yml.sample.

Uncommented added variables in ceph-defaults

Updated tests by adding value for radosgw_interface

Added radosgw_interface to centos cluster tests

Modified ceph-rgw role,rebased and ran generate_group_vars_sample.sh

In ceph-rgw role removed check_mandatory_vars.yml.
Rebased on master.
Ran generate_group_vars_sample.sh and then the below files got
modified.