cli: add alias to nmcli device connect|disconnect

nmcli now accepts `nmcli device up|down` which works the same way as
`nmcli device connect|disconnect`

I also edited man pages of nmcli with new options.

man/nmcli.xml

@@ -1323,9 +1323,11 @@
         <arg choice='plain'><command>status</command></arg>
         <arg choice='plain'><command>show</command></arg>
         <arg choice='plain'><command>set</command></arg>
+        <arg choice='plain'><command>up</command></arg>
         <arg choice='plain'><command>connect</command></arg>
         <arg choice='plain'><command>reapply</command></arg>
         <arg choice='plain'><command>modify</command></arg>
+        <arg choice='plain'><command>down</command></arg>
         <arg choice='plain'><command>disconnect</command></arg>
         <arg choice='plain'><command>delete</command></arg>
         <arg choice='plain'><command>monitor</command></arg>
@@ -1391,7 +1393,7 @@
 
       <varlistentry>
         <term>
-          <command>connect</command>
+          <command>up</command>
           <arg choice='plain'><replaceable>ifname</replaceable></arg>
         </term>
 
@@ -1410,6 +1412,18 @@
         </listitem>
       </varlistentry>
       
+      <varlistentry>
+        <term>
+          <command>connect</command>
+          <arg choice='plain'><replaceable>ifname</replaceable></arg>
+        </term>
+
+        <listitem>
+          <para> Alias for command <command>up</command>
+          </para>
+        </listitem>
+      </varlistentry>
+
       <varlistentry>
         <term>
           <command>reapply</command>
@@ -1448,7 +1462,7 @@
 
       <varlistentry>
         <term>
-          <command>disconnect</command>
+          <command>down</command>
           <arg choice='plain' rep='repeat'><replaceable>ifname</replaceable></arg>
         </term>
 
@@ -1462,6 +1476,17 @@
         </listitem>
       </varlistentry>
      
+      <varlistentry>
+        <term>
+          <command>disconnect</command>
+          <arg choice='plain' rep='repeat'><replaceable>ifname</replaceable></arg>
+        </term>
+
+        <listitem>
+          <para> Alias for command <command>down</command>
+          </para>
+        </listitem>
+      </varlistentry>
 
       <varlistentry>
         <term>

src/nmcli/devices.c

@@ -5032,6 +5032,8 @@ nmc_command_func_device(const NMCCommand *cmd, NmCli *nmc, int argc, const char
         {"lldp", do_device_lldp, usage_device_lldp, FALSE, FALSE},
         {"modify", do_device_modify, usage_device_modify, TRUE, TRUE},
         {NULL, do_devices_status, usage, TRUE, TRUE},
+        {"up", do_device_connect, usage_device_connect, TRUE, TRUE},
+        {"down", do_devices_disconnect, usage_device_disconnect, TRUE, TRUE},
     };
 
     next_arg(nmc, &argc, &argv, NULL);