Remove all networking group_vars but VyOS (#28869)

Ansible-test will consume group_vars from test/integration, as it runs
from that working directory. This causes problems if we specify vars
in inventory as they have higher precedence, plus it gives the impression
to users those group_vars can be reused.
Leaving vyos since it's configured to run in Shippable and apparently
it breaks if there are no group_vars in the test/integration folder.

test/integration/group_vars/asa.yaml

@@ -1,8 +0,0 @@
----
-cli:
-  host: "{{ inventory_hostname }}"
-  username: "{{ asa_cli_user | default('cisco') }}"
-  password: "{{ asa_cli_pass | default('cisco') }}"
-  transport: cli
-  authorize: yes
-  auth_pass: "{{ asa_auth_pass | default('cisco') }}"

test/integration/group_vars/dellos10.yaml

@@ -1,6 +0,0 @@
----
-cli:
-  host: "{{ ansible_host }}"
-  username: "{{ dellos10_cli_user | default('admin') }}"
-  password: "{{ dellos10_cli_pass | default('admin') }}"
-  transport: cli

test/integration/group_vars/dellos6.yaml

@@ -1,8 +0,0 @@
----
-cli:
-  host: "{{ ansible_host }}"
-  username: "{{ dellos_cli_user | default('admin') }}"
-  password: "{{ dellos_cli_pass | default('admin') }}"
-  authorize: true
-  auth_pass: "{{ dellos_cli_auth_pass | default('calvin') }}"
-  transport: cli

test/integration/group_vars/dellos9.yaml

@@ -1,8 +0,0 @@
----
-cli:
-  host: "{{ ansible_host }}"
-  username: "{{ dellos9_cli_user | default('admin') }}"
-  password: "{{ dellos9_cli_pass | default('admin') }}"
-  authorize: true
-  auth_pass: "{{ dellos9_cli_en_pass | default('calvin') }}"
-  transport: cli

test/integration/group_vars/eos.yaml

@@ -1,13 +0,0 @@
----
-cli:
-  host: "{{ ansible_host }}"
-  transport: cli
-  authorize: yes
-
-eapi:
-  host: "{{ ansible_host }}"
-  transport: eapi
-  timeout: 60
-  use_ssl: no
-  port: 80
-  authorize: yes

test/integration/group_vars/ios.yaml

@@ -1,6 +0,0 @@
----
-cli:
-  host: "{{ inventory_hostname }}"
-  username: "{{ ios_cli_user | default('cisco') }}"
-  password: "{{ ios_cli_pass | default('cisco') }}"
-  transport: cli

test/integration/group_vars/iosxr.yaml

@@ -1,6 +0,0 @@
----
-cli:
-  host: "{{ inventory_hostname }}"
-  username: "{{ iosxr_cli_user | default('root') }}"
-  password: "{{ iosxr_cli_pass | default('root') }}"
-  transport: cli

test/integration/group_vars/junos.yaml

@@ -1,12 +0,0 @@
----
-netconf:
-  host: "{{ ansible_ssh_host }}"
-  #username: "{{ junos_cli_user | default('ansible') }}"
-  #password: "{{ junos_cli_pass | default('Ansible') }}"
-  transport: netconf
-
-cli:
-  host: "{{ ansible_ssh_host }}"
-  #username: "{{ junos_cli_user | default('ansible') }}"
-  #password: "{{ junos_cli_pass | default('Ansible') }}"
-  transport: cli

test/integration/group_vars/nxos.yaml

@@ -1,14 +0,0 @@
----
-cli:
-  host: "{{ ansible_ssh_host }}"
-  #username: "{{ nxos_cli_user | default('admin') }}"
-  #password: "{{ nxos_cli_pass | default('admin') }}"
-  transport: cli
-
-nxapi:
-  host: "{{ ansible_ssh_host }}"
-  #username: "{{ nxos_nxapi_user | default('admin') }}"
-  #password: "{{ nxos_nxapi_pass | default('admin') }}"
-  transport: nxapi
-  use_ssl: no
-  port: 8080

test/integration/group_vars/ops.yaml

@@ -1,6 +0,0 @@
----
-cli:
-  host: "{{ inventory_hostname }}"
-  username: "{{ ops_cli_user | default('netop') }}"
-  password: "{{ ops_cli_pass | default('netop') }}"
-  transport: cli