Skips enabling kernel bridge firewall in container

Calling enable_kernel_bridge_firewall inside a
container, devstack will crash because it tries to
load a kernel module by calling 'sudo modprobe' on
net.bridge.

Change-Id: Id4718c065d5a8c507d49f38e19c2796a64221aa4
Closes-Bug: #1662194

functions

@@ -664,6 +664,16 @@ function set_mtu {
 }
 
 
+# running_in_container - Returns true otherwise false
+function running_in_container {
+    if grep -q lxc /proc/1/cgroup; then
+        return 0
+    fi
+
+    return 1
+}
+
+
 # enable_kernel_bridge_firewall - Enable kernel support for bridge firewalling
 function enable_kernel_bridge_firewall {
     # Load bridge module. This module provides access to firewall for bridged

lib/neutron

@@ -188,7 +188,9 @@ function configure_neutron_new {
             iniset $NEUTRON_CORE_PLUGIN_CONF ovs local_ip $HOST_IP
         fi
 
-        enable_kernel_bridge_firewall
+        if ! running_in_container; then
+            enable_kernel_bridge_firewall
+        fi
     fi
 
     # DHCP Agent

lib/neutron_plugins/linuxbridge_agent

@@ -71,7 +71,9 @@ function neutron_plugin_configure_plugin_agent {
     fi
     if [[ "$Q_USE_SECGROUP" == "True" ]]; then
         iniset /$Q_PLUGIN_CONF_FILE securitygroup firewall_driver neutron.agent.linux.iptables_firewall.IptablesFirewallDriver
-        enable_kernel_bridge_firewall
+        if ! running_in_container; then
+            enable_kernel_bridge_firewall
+        fi
     else
         iniset /$Q_PLUGIN_CONF_FILE securitygroup firewall_driver neutron.agent.firewall.NoopFirewallDriver
     fi

lib/neutron_plugins/ovs_base

@@ -88,7 +88,9 @@ function _neutron_ovs_base_configure_debug_command {
 function _neutron_ovs_base_configure_firewall_driver {
     if [[ "$Q_USE_SECGROUP" == "True" ]]; then
         iniset /$Q_PLUGIN_CONF_FILE securitygroup firewall_driver iptables_hybrid
-        enable_kernel_bridge_firewall
+        if ! running_in_container; then
+            enable_kernel_bridge_firewall
+        fi
     else
         iniset /$Q_PLUGIN_CONF_FILE securitygroup firewall_driver noop
     fi

lib/nova

@@ -864,7 +864,9 @@ function start_nova_rest {
     run_process n-crt "$NOVA_BIN_DIR/nova-cert --config-file $api_cell_conf"
 
     if is_service_enabled n-net; then
-        enable_kernel_bridge_firewall
+        if ! running_in_container; then
+            enable_kernel_bridge_firewall
+        fi
     fi
     run_process n-net "$NOVA_BIN_DIR/nova-network --config-file $compute_cell_conf"