ggsn: vty: Require ggsn param in <show pdp-context> cmd

Other similar commands already do it. This way we also get rid of
deprecated APIs, supporting search when more than one GSN is set up.

Related: OS#2873
Change-Id: I8357e20076348c8ded5e9f5b8e7252566b0fbfea
diff --git a/doc/manuals/vty/ggsn_vty_reference.xml b/doc/manuals/vty/ggsn_vty_reference.xml
index a226f8f..a395b23 100644
--- a/doc/manuals/vty/ggsn_vty_reference.xml
+++ b/doc/manuals/vty/ggsn_vty_reference.xml
@@ -351,10 +351,12 @@
         <param name='APN' doc='APN name' />
       </params>
     </command>
-    <command id='show pdp-context imsi IMSI [&lt;0-15&gt;]'>
+    <command id='show pdp-context ggsn NAME imsi IMSI [&lt;0-15&gt;]'>
       <params>
         <param name='show' doc='Show running system information' />
         <param name='pdp-context' doc='Display information on PDP Context' />
+        <param name='ggsn' doc='Gateway GPRS Support NODE (GGSN)' />
+        <param name='NAME' doc='GGSN Name' />
         <param name='imsi' doc='PDP contexts for given IMSI' />
         <param name='IMSI' doc='PDP context for given NSAPI' />
         <param name='[&lt;0-15&gt;]' doc='(null)' />
@@ -709,10 +711,12 @@
         <param name='APN' doc='APN name' />
       </params>
     </command>
-    <command id='show pdp-context imsi IMSI [&lt;0-15&gt;]'>
+    <command id='show pdp-context ggsn NAME imsi IMSI [&lt;0-15&gt;]'>
       <params>
         <param name='show' doc='Show running system information' />
         <param name='pdp-context' doc='Display information on PDP Context' />
+        <param name='ggsn' doc='Gateway GPRS Support NODE (GGSN)' />
+        <param name='NAME' doc='GGSN Name' />
         <param name='imsi' doc='PDP contexts for given IMSI' />
         <param name='IMSI' doc='PDP context for given NSAPI' />
         <param name='[&lt;0-15&gt;]' doc='(null)' />