add gentoo support to memcached role

Change-Id: I987abf6fc161f09312fbef984552313989ef3c31

templates/memcached.gentoo.j2

@@ -0,0 +1,17 @@
+# {{ ansible_managed }}
+{% if debug | bool %}
+  {% set _verbosity = '-vvv' %}
+{% else %}
+  {% set _verbosity = '-v' %}
+{% endif %}
+
+MEMCACHED_BINARY="/usr/bin/memcached"
+PIDBASE="/var/run/memcached/memcached"
+MEMUSAGE="{{ memcached_memory }}"
+MEMCACHED_RUNAS="{{ memcached_user }}"
+MAXCONN="{{ memcached_connections }}"
+LISTENON="{{ memcached_listen }}"
+PORT="{{ memcached_port }}"
+UDPPORT="${PORT}"
+MISC_OPTS="-t {{ memcached_threads }} {{ _verbosity }}"
+

vars/gentoo.yml

@@ -0,0 +1,24 @@
+---
+# Copyright 2019, Matthew Thode
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+memcached_user: memcached
+
+memcached_distro_packages:
+  - net-misc/memcached
+  - net-analyzer/netcat
+
+memcached_conf_template: memcached.gentoo.j2
+
+memcached_conf_dest: /etc/memcached.conf