Make ansible_host optional for all switch types

The Juniper device support allows ansible_host variable to not be set
for a switch, in which case the inventory_hostname will be used instead.

This change applies this default consistently across all switch types.

Change-Id: Ibc1e673a6b988f2e8d7bb6c62d30ccdb7ce96351
Story: 2004358
Task: 27958

ansible/group_vars/all/switches/dell

@@ -7,7 +7,7 @@
 # For DellOS switches, this defines a 'provider' argument to the dellos_*
 # modules.
 switch_dellos_provider:
-  host: "{{ ansible_host }}"
+  host: "{{ ansible_host|default(inventory_hostname) }}"
   username: "{{ ansible_user }}"
   password: "{{ ansible_ssh_pass }}"
   transport: cli

ansible/group_vars/all/switches/dell-powerconnect

@@ -7,6 +7,6 @@
 # For DellOS switches, this defines a 'provider' argument to the
 # dell_powerconnect_switch role.
 switch_dell_powerconnect_provider:
-  host: "{{ ansible_host }}"
+  host: "{{ ansible_host|default(inventory_hostname) }}"
   username: "{{ ansible_user }}"
   auth_pass: "{{ switch_auth_pass }}"

ansible/group_vars/all/switches/mellanox

@@ -7,6 +7,6 @@
 # For Mellanox switches, this defines a 'provider' argument to the
 # mellanox-switch role.
 switch_mellanox_provider:
-  host: "{{ ansible_host }}"
+  host: "{{ ansible_host|default(inventory_hostname) }}"
   username: "{{ ansible_user }}"
   auth_pass: "{{ switch_auth_pass }}"

doc/source/configuration/physical-network.rst

@@ -182,7 +182,7 @@ Configuration for these devices is applied using the ``dellos6_config`` and
 Provider
 ^^^^^^^^
 
-* ``ansible_host`` is the hostname or IP address.
+* ``ansible_host`` is the hostname or IP address.  Optional.
 
 * ``ansible_user`` is the SSH username.
 
@@ -205,7 +205,7 @@ Configuration for these devices is applied using the
 Provider
 ^^^^^^^^
 
-* ``ansible_host`` is the hostname or IP address.
+* ``ansible_host`` is the hostname or IP address.  Optional.
 
 * ``ansible_user`` is the SSH username.
 
@@ -254,7 +254,7 @@ Ansible module to automate interaction with the switch CLI via SSH.
 Provider
 ^^^^^^^^
 
-* ``ansible_host`` is the hostname or IP address.
+* ``ansible_host`` is the hostname or IP address.  Optional.
 
 * ``ansible_user`` is the SSH username.