added note on advanced shell privs per BZ

Author: mburke5678

install_config/router/f5_router.adoc

@@ -44,6 +44,7 @@ requirements:
 * A F5 host IP with:
 ** Credentials for API access
 ** SSH access via a private key
+* An F5 user with Advanced Shell access
 * A virtual server for HTTP routes:
 ** _HTTP profile_ must be _http_.
 * A virtual server with HTTP profile routes:
@@ -133,7 +134,8 @@ BIG-IP®* host:
 address.
 
 |`--external-host-username`
-|Specifies the *F5 BIG-IP®* user name (typically *admin*).
+|Specifies the *F5 BIG-IP®* user name (typically *admin*). 
+The *F5 BIG-IP* user account must have access to the Advanced Shell (Bash) on the F5 BIG-IP system.
 
 |`--external-host-password`
 |Specifies the *F5 BIG-IP®* password.
@@ -343,4 +345,9 @@ $ oc adm router \
     --external-host-vxlan-gw=10.131.0.5/14
 ----
 +
+[NOTE]
++
+====
+The `external-host-username` is a *F5 BIG-IP* user account with access to the Advanced Shell (Bash) on the F5 BIG-IP system.
+
 The F5 setup is now ready, without the need to set up the ramp node.