Squashed 'blocks/vmoodle/' changes from cec283d..3598b10

3598b10 remove production vconfig.php traces, small fixes in adminsetting pages
0d46349 Add Mahara adds on for automated key rotation
29dd1df Add plugin related commands. Fix all other metacommands. Security change in bootlib.

git-subtree-dir: blocks/vmoodle
git-subtree-split: 3598b1079fb3ac4971da74b91d5701c3e1001079
Merge commit '50af5b28e9a5eb185e5f59f1bef4094533392801' into ced-MOODLE_25_STABLE