Skip /usr fs check when disabling protection if forced

There are some scenarios where we want to skip the check for
the root filesystem (for instance in some jenkins pipelines) if
the operation has the force parameter set.

src/freenas/usr/local/libexec/disable-rootfs-protection

@@ -112,7 +112,10 @@ if __name__ == '__main__':
         ))
         sys.exit(1)
 
-    usr_fs_check()
+    # We currently use this script inside some jenkins pipelines that are not
+    # normal truenas install and so we need to skip the fs check on force.
+    if not args.force:
+        usr_fs_check()
 
     rv = run([ZFS_CMD, 'get', '-o', 'value', '-H', 'truenas:developer', '/'], capture_output=True)