Adding a geard element

geard is a python implementation of the gearman broker.
The intention is to use it to broker tripleo ci jobs.

Change-Id: Iec1889edee7641449cda7e0a8770062c564c3d97

elements/geard/README.md

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+Element to install gear and run geard
+
+geard is a python implementation of the gearman protocol server
+https://pypi.python.org/pypi/gear

elements/geard/element-deps

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+os-svc-install
+os-refresh-config

elements/geard/install.d/44-geard

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+#!/bin/bash
+set -eux
+
+install-packages python-virtualenv
+
+mkdir -p /opt/stack/venvs
+virtualenv /opt/stack/venvs/gear
+
+/opt/stack/venvs/gear/bin/pip install gear
+
+useradd gear
+os-svc-daemon -n geard -u gear -c geard -- -d

elements/geard/os-refresh-config/pre-configure.d/97-gearman-iptables

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+#!/bin/bash
+set -eu
+
+OK=/opt/stack/gearman-iptables.ok
+
+if [ -e $OK ] ; then
+    exit 0
+fi
+
+DISTRO=`lsb_release -si` || true
+
+if [[ "Fedora" = $DISTRO ]]; then
+
+    # Check if the iptables service is active
+    if systemctl is-active iptables.service ; then
+        IPT_FILE=/etc/sysconfig/iptables
+        if [ -f $IPT_FILE ]; then
+            iptables-restore < $IPT_FILE
+        fi
+
+        # Gearman server
+        iptables -I INPUT -p tcp --dport 4730 -j ACCEPT
+
+        iptables-save > $IPT_FILE
+
+    fi
+
+fi
+
+touch $OK