when using fs_path FS sets it as a route header and if not removed breaks upstream elements (#144)

(cherry picked from commit 94c97087a1)

kamailio/default.cfg

@@ -517,11 +517,12 @@ route[PREPARE_INITIAL_REQUESTS]
     }
 
     if (!isflagset(FLAG_INTERNALLY_SOURCED)) {
+        xlog("L_INFO", "$ci|log|call is not from internal source, recording route");
         remove_hf("Route");
-    }
-
-    if(!isflagset(FLAG_INTERNALLY_SOURCED)) {
         record_route();
+    } else if (loose_route()) {
+        xlog("L_WARN", "$ci|end|loose routing of internal initial request\n");
+        exit();
     }
 
 }
@@ -546,6 +547,7 @@ route[BRANCH_HEADERS]
         route(AUTH_HEADERS);
     } else {
         remove_hf_re("^X-");
+        remove_hf_re("^k-cid");
     }
 }