Remove change_apache_user_group function

This function allowed you to change the process running user for all of
apache. This is better handled on a per-process basis.

Change-Id: I165adc0c49fc328f34835856b49983c4e189f143
Fixes: bug 1226346
Fixes: bug 1225853

lib/apache

@@ -4,7 +4,6 @@
 # Dependencies:
 # ``functions`` file
 # is_apache_enabled_service
-# change_apache_user_group
 # install_apache_wsgi
 # config_apache_wsgi
 # start_apache_server
@@ -52,29 +51,6 @@ function is_apache_enabled_service() {
     return 1
 }
 
-# change_apache_user_group() - Change the User/Group to run Apache server
-function change_apache_user_group(){
-    local stack_user=$@
-    if is_ubuntu; then
-        sudo sed -e "
-            s/^export APACHE_RUN_USER=.*/export APACHE_RUN_USER=${stack_user}/g;
-            s/^export APACHE_RUN_GROUP=.*/export APACHE_RUN_GROUP=${stack_user}/g
-        " -i /etc/${APACHE_NAME}/envvars
-    elif is_fedora; then
-        sudo sed -e "
-            s/^User .*/User ${stack_user}/g;
-            s/^Group .*/Group ${stack_user}/g
-        " -i /etc/${APACHE_NAME}/httpd.conf
-    elif is_suse; then
-        sudo sed -e "
-            s/^User .*/User ${stack_user}/g;
-            s/^Group .*/Group ${stack_user}/g
-        " -i /etc/${APACHE_NAME}/uid.conf
-    else
-        exit_distro_not_supported "apache user and group"
-    fi
-}
-
 # install_apache_wsgi() - Install Apache server and wsgi module
 function install_apache_wsgi() {
     # Apache installation, because we mark it NOPRIME