create missing apache2 directory on Debian/Ubuntu

Ubuntu/source deployment of horizon and placement-api failed:

+ exec /usr/sbin/apache2 -DFOREGROUND
apache2: Syntax error on line 80 of /etc/apache2/apache2.conf: DefaultRuntimeDir must be a valid directory, absolute or relative to ServerRoot

Once directory is in place it works fine.

Change-Id: Icbd500e5b16deb0eafc0821a1c117794ddb8ae62

docker/horizon/extend_start.sh

@@ -340,6 +340,7 @@ config_zun_dashboard
 if [[ "${KOLLA_BASE_DISTRO}" =~ debian|ubuntu ]]; then
     # Loading Apache2 ENV variables
     . /etc/apache2/envvars
+    install -d /var/run/apache2/
     rm -rf /var/run/apache2/*
 else
     rm -rf /var/run/httpd/* /run/httpd/* /tmp/httpd*

docker/placement/placement-api/extend_start.sh

@@ -25,6 +25,7 @@ fi
 if [[ "${KOLLA_BASE_DISTRO}" =~ debian|ubuntu ]]; then
     # Loading Apache2 ENV variables
     . /etc/apache2/envvars
+    install -d /var/run/apache2/
     rm -rf /var/run/apache2/*
 else
     rm -rf /var/run/httpd/* /run/httpd/* /tmp/httpd*