Remove random sleep interval from acquire_lock

The function caused problems with tests and the random sleep is truly not
needed (legacy code and it doesn't bring any visible benefits).

server/core/skygw_utils.cc

@@ -29,7 +29,6 @@
 #include <sys/time.h>
 #include "maxscale/skygw_utils.h"
 #include <maxscale/atomic.h>
-#include <maxscale/random_jkiss.h>
 #include <pcre2.h>
 
 #if !defined(PATH_MAX)
@@ -467,7 +466,7 @@ void acquire_lock(int* l)
         misscount += 1;
         if (misscount > 10)
         {
-            ts1.tv_nsec = (random_jkiss() % misscount) * 1000000;
+            ts1.tv_nsec = misscount * 1000000;
             nanosleep(&ts1, NULL);
         }
     }