TT#51701 Switch from deprecated /var/lock to /run/lock

/var/lock was deprecated with Debian/wheezy (see
https://wiki.debian.org/ReleaseGoals/RunDirectory), so
/var/lock/mediator.lock is actually /run/lock/mediator.lock.
Reflect this in the definition of MEDIATOR_LOCK_FILE.

Change-Id: If50a5fdcfafb289d59ae828f750388e103b5b3ad

mediator.h

@@ -16,7 +16,7 @@
 #define MEDIATOR_DEFAULT_INTERVAL 10
 
 #define MEDIATOR_SYSLOG_NAME "mediator"
-#define MEDIATOR_LOCK_FILE "/var/lock/mediator.lock"
+#define MEDIATOR_LOCK_FILE "/run/lock/mediator.lock"
 #define MEDIATOR_DEFAULT_CONFIG_FILE "/etc/ngcp-mediator/ngcp-mediator.conf"
 #define MEDIATOR_DEFAULT_DAEMONIZE 0
 #define MEDIATOR_DEFAULT_DUMPCDR 0