Manpage for KVM daemon

Add manpage for the KVM daemon.
Signed-off-by: Jose A. Lopes <jabolopes@google.com>
Reviewed-by: Michele Tartara <mtartara@google.com>

Makefile.am

@@ -1195,6 +1195,7 @@ man_MANS = \
 	man/ganeti-confd.8 \
 	man/ganeti-luxid.8 \
 	man/ganeti-listrunner.8 \
+	man/ganeti-kvmd.8 \
 	man/ganeti-masterd.8 \
 	man/ganeti-mond.8 \
 	man/ganeti-noded.8 \

man/ganeti-kvmd.rst

+ganeti-kvmd(8) Ganeti | Version @GANETI_VERSION@
+================================================
+
+Name
+----
+
+ganeti-kvmd - Ganeti KVM daemon
+
+Synopsis
+--------
+
+**ganeti-kvmd**
+
+DESCRIPTION
+-----------
+
+The KVM daemon is responsible for determining whether a given KVM
+instance was shutdown by an administrator or a user.
+
+The KVM daemon monitors, using ``inotify``, KVM instances through
+their QMP sockets, which are provided by KVM.  Using the QMP sockets,
+the KVM daemon listens for particular shutdown, powerdown, and stop
+events which will determine if a given instance was shutdown by the
+user or Ganeti, and this result is communicated to Ganeti via a
+special file in the filesystem.
+
+FILES
+-----
+
+The KVM daemon monitors Qmp sockets of KVM instances, which are created
+in the KVM control directory, located under
+``@LOCALSTATEDIR@/run/ganeti/kvm-hypervisor/ctrl/``.  The KVM daemon
+also creates shutdown files in this directory.  Finally, the KVM
+daemon's log file is located under
+``@LOCALSTATEDIR@/log/ganeti/ganeti-kvmd.log``.  Removal of the KVM
+control directory, the shutdown files, or the log file, will lead to no
+errors on the KVM daemon.