Remove wrong error message if pushing a new ref fails

If pushing a new ref is rejected because the user is not allowed to
create it the error message always told the user that he's missing the
'Create Reference' access right. This is not true in all cases, users
may have the 'Create Reference' access right assigned and still they
are not allowed to create the ref:
- pushing an annotated tag requires the 'Push Annotated Tag' access
  right
- pushing a signed tag requires the 'Push Signed Tag' access right
- the project state may be set to 'Read Only'

It is better to have a generic error message that is described in the
documentation than having a more concrete error message that is wrong
in some cases. A wrong error message misleads and confuses the user.

Updating the description of the 'Prohibited by Gerrit' error in the
documentation to explain some additional cases in which this error
occurs.

Bug: issue 1767
Change-Id: I45470256107198ae9208ccc375a6ec8d0c4f6e1d
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
2 files changed