snap: add vtysh as a "proper" command alias for frr.vtysh

This allows direct access to vtysh without the "frr." prefix.
   The alias can be enabled by sudo snap frr vtysh

Signed-off-by: Jafar Al-Gharaibeh <jafar@atcorp.com>

snapcraft/README.snap_build.md

@@ -94,7 +94,16 @@ All the commands are prefixed with frr.
     frr.zebra-debug
 
 vtysh can be accessed as frr.vtysh (Make sure you have /snap/bin in your
-path). If access as `vtysh` instead of `frr.vtysh` is needed, a symlink 
+path). If access as `vtysh` instead of `frr.vtysh` is needed, you can enable it
-can be created:
+via a snap alias as follows:
 
-    sudo ln -s /snap/bin/frr.vtysh /usr/local/bin/vtysh
+   sudo snap alias frr vtysh
+
+This will add the vtysh command to your /snap/bin for direct access. The output of
+
+   sudo snap aliases
+
+should list vtysh command alias as enabled:
+
+App          Alias    Notes
+frr.vtysh    vtysh    enabled

snapcraft/README.usage.md

@@ -117,6 +117,10 @@ FAQ
       This is a limitation of any snap package at this time which
       requires priviledged interfaces (ie to manipulate routing tables)
 
+- Can I run vtysh directly without the "frr." prefix?
+    - Yes, enable the vtysh alias in the frr snap package by:
+      sudo snap alias frr vtysh
+	
 Sourcecode available
 ====================
 

snapcraft/snapcraft.yaml.in

@@ -16,6 +16,7 @@ apps:
             - network
             - network-bind
             - network-control
+        aliases: [vtysh]
     version:
         command: bin/show_version
     readme: