Create custom dir for uwsgi domain sockets

On Centos, apache has a private view of /tmp and thus can't see this
socket, causing keystone to fail. This happened after
I46294fb24e3c23fa19fcfd7d6c9ee8a932354702.

Move it to /var/run.

Closes-Bug: #1684360
Change-Id: I47f091656802719c259752454ec88bf50760b967
diff --git a/lib/apache b/lib/apache
index f88f1d3..afeac15 100644
--- a/lib/apache
+++ b/lib/apache
@@ -230,7 +230,12 @@
     local http=$4
     local name=""
     name=$(basename $wsgi)
-    local socket="/tmp/${name}.socket"
+
+    # create a home for the sockets; note don't use /tmp -- apache has
+    # a private view of it on some platforms.
+    local socket_dir='/var/run/uwsgi'
+    sudo install -d -o $STACK_USER -m 755 $socket_dir
+    local socket="$socket_dir/${name}.socket"
 
     # always cleanup given that we are using iniset here
     rm -rf $file