The roles which have edit permissions on group views is set for each
grouptype.  This changes the setting to be per-group.

Partially addresses bug #547362, bug #631189

Change-Id: I3f51f0ed44b7f479a094a2c5b2e2ee4807722e34
Signed-off-by: Richard Mansfield <richard.mansfield@catalyst.net.nz>