fixed bug when updating user when no roles were selected, changed change-password link

Dependencies

• [2] SZYDW2DG hydra: added some user admin
• [3] SMCOU72F hydra: add some admin for adding/enabling/etc build machines
• [4] F7S2EGV2 hydra: cannot change username, also update fullname
• [*] ZWCTAZGL added newsitems, added some admin options to clear various caches.

Change contents

• replacement in src/lib/Hydra/Controller/Admin.pm at line 86
  [2.1035]→[2.1035:1089](∅→∅)
  − $user->userroles->create({ role => $roles}) ;
  [2.1035]

  [2.1089]
  + $user->userroles->create({ role => $roles}) if defined $roles ;
• replacement in src/lib/Hydra/Controller/Admin.pm at line 161
  [2.2855]→[2.2855:2927](∅→∅)
  − "You can change your password at http://".hostname_long." .\n".
  [2.2855]

  [2.2927]
  + "You can change your password at http://".hostname_long."/change-password .\n".