Revert "Deprecate support for Arista plugin"

This reverts commit 5067451ddefe61902cf4b53734c040efe330da96.

Reason for revert:
We still see maintenance effort in the repository[1].

[1] https://opendev.org/x/networking-arista

Change-Id: I02b4649bb3e8224ffb4243da65f57b1891270a46

manifests/plugins/ml2/arista.pp

@@ -17,8 +17,6 @@
 #
 # == Class: neutron::plugins::ml2::arista
 #
-# DEPRECATED!
-#
 # === Parameters
 #
 # [*eapi_host*]
@@ -57,9 +55,6 @@ class neutron::plugins::ml2::arista(
   include neutron::deps
   require neutron::plugins::ml2
 
-  warning('Support for Arista plugin is deprecated and will be removed \
-in a future release')
-
   neutron_plugin_ml2 {
     'ml2_arista/eapi_host'    : value => $eapi_host;
     'ml2_arista/eapi_username': value => $eapi_username;

manifests/plugins/ml2/arista/l3.pp

@@ -17,8 +17,6 @@
 #
 # == Class: neutron::plugins::ml2::arista::l3_arista
 #
-# DEPRECATED!
-#
 # === Parameters
 #
 # [*primary_l3_host*]
@@ -62,9 +60,6 @@ class neutron::plugins::ml2::arista::l3(
   include neutron::deps
   require neutron::plugins::ml2
 
-  warning('Support for Arista plugin is deprecated and will be removed \
-in a future release')
-
   if !is_service_default($mlag_config) {
     validate_legacy(Boolean, 'validate_bool', $mlag_config)
     if $mlag_config and is_service_default($secondary_l3_host) {

releasenotes/notes/undeprecate-arista-plugin-a19557b2b5a6f67a.yaml

@@ -0,0 +1,5 @@
+---
+other:
+  - |
+    Deprecaiton of support for Arista plugin has been reverted, since
+    the repository is still maintained.