Add gnt-network man page

Signed-off-by: Apollon Oikonomopoulos <apollon@noc.grnet.gr>
Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>
Reviewed-by: Iustin Pop <iustin@google.com>

diff --git a/man/gnt-network.rst b/man/gnt-network.rst
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+gnt-network(8) Ganeti | Version @GANETI_VERSION@
+================================================
+
+Name
+----
+
+gnt-network - Ganeti network administration
+
+Synopsis
+--------
+
+**gnt-network** {command} [arguments...]
+
+DESCRIPTION
+-----------
+
+The **gnt-network** command is used for network definition administration
+in the Ganeti system.
+
+COMMANDS
+--------
+
+ADD
+~~~
+
+| **add**
+| [--network=*NETWORK*]
+| [--gateway=*GATEWAY*]
+| [--add-reserved-ips=*RESERVEDIPS*]
+| [--network6=*NETWORK6*]
+| [--gateway6=*GATEWAY6*]
+| [--mac-prefix=*MACPREFIX*]
+| [--network-type=*NETWORKTYPE*]
+| {*network*}
+
+Creates a new network with the given name. The network will be unused
+initially. To connect it to a node group, use ``gnt-network connect``.
+``--network`` option is mandatory. All other are optional.
+
+The ``--network`` option allows you to specify the network in a CIDR notation.
+
+The ``--gateway`` option allows you to specify the default gateway for this
+network.
+
+The ``--network-type`` can be none, private or public.
+
+IPv6 semantics can be assigned to the network via the ``--network6`` and
+``--gateway6`` options. IP pool is meaningless for ipv6 so those two values
+can be used for EUI64 generation from a NIC's mac value.
+
+MODIFY
+~~~~~~
+
+| **modify**
+| [--gateway=*GATEWAY*]
+| [--add-reserved-ips=*RESERVEDIPS*]
+| [--remove-reserved-ips=*RESERVEDIPS*]
+| [--network6=*NETWORK6*]
+| [--gateway6=*GATEWAY6*]
+| [--mac-prefix=*MACPREFIX*]
+| [--network-type=*NETWORKTYPE*]
+| {*network*}
+
+Modifies parameters from the network.
+
+Unable to modify network (ip range). Create a new network if you want to do
+so. All other options are documented in the **add** command above.
+
+REMOVE
+~~~~~~
+
+| **remove** {*network*}
+
+Deletes the indicated network, which must be not connected to any node group.
+
+LIST
+~~~~
+
+| **list** [--no-headers] [--separator=*SEPARATOR*] [-v]
+| [-o *[+]FIELD,...*] [network...]
+
+Lists all existing networks in the cluster.
+
+The ``--no-headers`` option will skip the initial header line. The
+``--separator`` option takes an argument which denotes what will be
+used between the output fields. Both these options are to help
+scripting.
+
+The ``-v`` option activates verbose mode, which changes the display of
+special field states (see **ganeti(7)**).
+
+The ``-o`` option takes a comma-separated list of output fields.
+If the value of the option starts with the character ``+``, the new
+fields will be added to the default list. This allows to quickly
+see the default list plus a few other fields, instead of retyping
+the entire list of fields.
+
+The available fields and their meaning are:
+
+name
+    the group name
+
+group_count
+    the number of nodegroups connected to the network
+
+group_list
+    the list of nodegroups connected to the network
+
+inst_cnt
+    the number of instances use the network
+
+inst_list
+    the list of instances that at least one of their NICs is assigned
+    to the network
+
+external_reservations
+    the IPs that cannot be assigned to an instance
+
+free_count
+    how many IPs have left in the pool
+
+gateway
+    the networks gateway
+
+map
+    a nice text depiction of the available/reserved IPs in the network
+
+reserved_count
+    how many IPs have been reserved so far in the network
+
+network6
+    the ipv6 prefix of the network
+
+gateway6
+    the ipv6 gateway of the network
+
+mac_prefix
+    the mac_prefix of the network (if a NIC is assigned to the network it
+    it gets the mac_prefix of the network)
+
+network_type
+    the type of the network (public, private)
+
+If no group names are given, then all groups are included. Otherwise,
+only the named groups will be listed.
+
+LIST-FIELDS
+~~~~~~~~~~~
+
+**list-fields** [field...]
+
+List available fields for networks.
+
+RENAME
+~~~~~~
+
+| **rename** {*oldname*} {*newname*}
+
+Renames a given network from *oldname* to *newname*. NOT implemeted yet
+
+INFO
+~~~~
+
+| **info** [network...]
+
+Displays information about a given network.
+
+CONNECT
+~~~~~~~
+| **connect** {*network*} {*group*} {*mode*} {*link*}
+
+Connect a network to a given nodegroup with the netparams (*mode*, *link*).
+Every nic will inherit those netparams if assigned in a network.
+*group* can be ``all`` if you want to connect to all existing nodegroups
+
+DISCONNECT
+~~~~~~~~~~
+| **disconnect** {*network*} {*group*}
+
+Disconnect a network to a nodegroup. This is possible only if no instance
+is using the network.