doc/man/8/ceph-monstore-tool: add documentation

Signed-off-by: Matan Breizman <mbreizma@redhat.com>

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+
+======================================================
+ ceph-monstore-tool -- ceph monstore manipulation tool
+======================================================
+
+.. program:: ceph-monstore-tool
+
+Synopsis
+========
+
+| **ceph-monstore-tool** <store path> <cmd> [args|options]
+
+
+Description
+===========
+
+:program:`ceph-monstore-tool` is similar to `ceph-kvstore-tool`. It allows
+users to manipulate MonitorDBStore's data (monmap, osdmap, etc.) offline.
+The default RocksDB debug level is `0`. This can be changed using `--debug`.
+
+Please Note:
+    Ceph-specific options should be in the format `--option-name=VAL`
+    (specifically, do not forget the '='!!)
+    Command-specific options need to be passed after a `--`
+    e.g., `get monmap --debug -- --version 10 --out /tmp/foo`
+
+Commands
+========
+
+:program:`ceph-monstore-tool` utility uses many commands for debugging purpose
+which are as follows:
+
+:command:`store-copy <path>`
+    Copies the store to PATH.
+
+:command:`get monmap [-- options]`
+    Get monmap (version VER if specified) (default: last committed).
+
+:command:`get osdmap [-- options]`
+    Get osdmap (version VER if specified) (default: last committed).
+
+:command:`get msdmap [-- options]`
+    Get msdmap (version VER if specified) (default: last committed).
+
+:command:`get mgr [-- options]`
+    Get mgrmap (version VER if specified) (default: last committed).
+
+:command:`get crushmap [-- options]`
+    Get crushmap (version VER if specified) (default: last committed).
+
+:command:`get osd_snap <key> [-- options]`
+    Get osd_snap key (`purged_snap` or `purged_epoch`).
+
+:command:`dump-keys`
+    Dumps store keys to FILE (default: stdout).
+
+:command:`dump-paxos [-- options]`
+    Dumps Paxos transactions  (-- -- help for more info).
+
+:command:`dump-trace FILE  [-- options]`
+    Dump contents of trace file FILE (-- --help for more info).
+
+:command:`replay-trace FILE  [-- options]`
+    Replay trace from FILE (-- --help for more info).
+
+:command:`random-gen [-- options]`
+    Add randomly genererated ops to the store (-- --help for more info).
+
+:command:`rewrite-crush [-- options]`
+    Add a rewrite commit to the store
+
+:command:`rebuild`
+    Rebuild store.
+
+:command:`rm <prefix> <key>`
+    Remove specified key from the store.
+
+Availability
+============
+
+**ceph-kvstore-tool** is part of Ceph, a massively scalable, open-source, distributed storage system. Please refer to
+the Ceph documentation at https://docs.ceph.com for more information.
+
+
+See also
+========
+
+:doc:`ceph <ceph>`\(8)