mgr/prometheus: cleanup the smb share processing logs

It logs the same output for as many share exists in the cluster.
Instead creating a debug log if we want to see the share that's being
processed and moving the generic message outside the for loop.

Currently, the logs look like this if you have lot of shares
```
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
Mar 28 04:43:11 ceph-node-00 ceph-mgr[2272]: [prometheus INFO prometheus] Processing SMB share resource
```

Signed-off-by: Nizamudeen A <nia@redhat.com>