frr: Add terminal and cliconf plugins (#51169)

* Added terminal plugin for FRR

Signed-off-by: NilashishC <nilashishchakraborty8@gmail.com>

* Added cliconf plugin for FRR

Signed-off-by: NilashishC <nilashishchakraborty8@gmail.com>

* Added cliconf plugin for FRR

Signed-off-by: NilashishC <nilashishchakraborty8@gmail.com>

* Override required methods

Signed-off-by: NilashishC <nilashishchakraborty8@gmail.com>

* Fix pep8 issues

Signed-off-by: NilashishC <nilashishchakraborty8@gmail.com>

* Add get_supported_protocols and minor error regex fix

Signed-off-by: NilashishC <nilashishchakraborty8@gmail.com>

* Remove unused imports

Signed-off-by: NilashishC <nilashishchakraborty8@gmail.com>

* Fix review comments

Signed-off-by: NilashishC <nilashishchakraborty8@gmail.com>

* Add get_diff and run_commands

Signed-off-by: NilashishC <nilashishchakraborty8@gmail.com>

* Set output to empty list

Signed-off-by: NilashishC <nilashishchakraborty8@gmail.com>

* Fix CI errors

Signed-off-by: NilashishC <nilashishchakraborty8@gmail.com>

lib/ansible/plugins/terminal/frr.py

@@ -0,0 +1,60 @@
+#
+# (c) 2018 Red Hat Inc.
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+#
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import re
+
+from ansible.errors import AnsibleConnectionFailure
+from ansible.plugins.terminal import TerminalBase
+
+
+class TerminalModule(TerminalBase):
+
+    terminal_stdout_re = [
+        re.compile(br"[\r\n]?[\w\+\-\.:\/\[\]]+(?:\([^\)]+\)){0,3}(?:[>#]) ?$")
+    ]
+
+    terminal_stderr_re = [
+        re.compile(br"% Command incomplete", re.I),
+        re.compile(br"% Unknown command", re.I),
+        re.compile(br"(?:\S+) instance is already running", re.I),
+        re.compile(br"% (?:Create|Specify) .* first", re.I),
+        re.compile(br"(?:\S+) is not running", re.I),
+        re.compile(br"% Can't find .*", re.I),
+        re.compile(br"invalid input", re.I),
+        re.compile(br"connection timed out", re.I),
+        re.compile(br"[^\r\n]+ not found"),
+    ]
+
+    def on_open_shell(self):
+        try:
+            self._exec_cli_command(b'terminal length 0')
+        except AnsibleConnectionFailure:
+            raise AnsibleConnectionFailure('unable to set terminal parameters')
+
+    def on_become(self, passwd=None):
+        # NOTE: For FRR, enable password only takes effect when telnetting to individual daemons
+        #       vtysh will always drop into enable mode since it runs as a privileged process
+        pass
+
+    def on_unbecome(self):
+        # NOTE: For FRR, enable password only takes effect when telnetting to individual daemons
+        #       vtysh will always drop into enable mode since it runs as a privileged process
+        pass