Fix apache2 error

Apache2 service was not restarting properly since Ubuntu14.04
which resulted in race conditions. This is explained in detail in the
script. Adds a work around to fix apache2 race invoked by lack of
www-browser virtual package linking to a basic text browser. Adding
w3m before hand to avoid any future issues. Ofcourse lynx or links
works here too.

Also provides more systematic stopping and starting of apache service
for eliminating restart/start-stop race issues.

Change-Id: I541d5b27bbfdda9b9f3eda72a0f13e9e8333faa2

labs/scripts/setup_lbaas_controller.sh

@@ -36,6 +36,23 @@ function check_dashboard_settings {
 echo "Checking dashboard configuration."
 check_dashboard_settings
 
+function check_apache_service {
+    # Check if apache service is down, if not force retry a couple of times.
+    sleep 10
+    i=0
+    until service apache2 status | grep 'not running'; do
+        sudo service apache2 stop
+        sleep 10
+        i ++
+        if [ $i -gt 3 ]
+        then
+            break
+        fi
+    done
+}
+
 echo "Reloading apache and memcached service."
-sudo service apache2 restart
+sudo service apache2 stop
+check_apache_service
+sudo service apache2 start
 sudo service memcached restart

labs/scripts/ubuntu/apt_init.sh

@@ -50,9 +50,20 @@ function ubuntu_cloud_archive {
         -o Dir::Etc::sourceparts="-" -o APT::Get::List-Cleanup="0"
 }
 
+function apache_fix {
+
+    # On '$service apache2 restart', apache will use a text browser to check
+    # connectivity on '127.0.0.1' or 'localhost'. Apache needs www-browser
+    # (/etc/alternatives/www-browser) virtual package to carry out this check.
+    # Include a basic text browser to preemptively avoid this error.
+    sudo apt-get -y install w3m
+
+}
+
 # precise needs the cloud archive, and so does trusty for non-Icehouse releases
 if grep -qs DISTRIB_CODENAME=precise /etc/lsb-release ||
         [ "$OPENSTACK_RELEASE" != "icehouse" ]; then
     echo "Enabling the Ubuntu cloud archive."
     ubuntu_cloud_archive
+    apache_fix
 fi

labs/scripts/ubuntu/setup_horizon.sh

@@ -53,6 +53,22 @@ function check_dashboard_settings {
 echo "Checking dashboard configuration."
 check_dashboard_settings
 
+function check_apache_service {
+    # Check if apache service is down, if not force retry a couple of times.
+    sleep 10
+    i=0
+    until service apache2 status | grep 'not running'; do
+        sudo service apache2 stop
+        sleep 10
+        i ++
+        if [ $i -gt 3]
+        then
+            break
+        fi
+    done
+}
+
 echo "Reloading apache and memcached service."
-sudo service apache2 restart
+sudo service apache2 stop
+check_apache_service
 sudo service memcached restart