Update apache tls proxy logs

This creates log files per proxy vhost and sets the log level to info to
help debug potential issues with tls proxying.

Change-Id: I02a62224662b021b35c293909ba045b4b74e1df8
diff --git a/lib/apache b/lib/apache
index 740f588..8a38cc4 100644
--- a/lib/apache
+++ b/lib/apache
@@ -39,6 +39,7 @@
     APACHE_NAME=apache2
     APACHE_CONF_DIR=${APACHE_CONF_DIR:-/etc/$APACHE_NAME/vhosts.d}
 fi
+APACHE_LOG_DIR="/var/log/${APACHE_NAME}"
 
 # Functions
 # ---------