archrelease: add checks for valid remote and up-to-date branch ref

It's safest to probe for the validity of the remote origin and abort
early otherwise. This also allows to print some hints how to create or
configure new repositories at appropriate times.
Additionally fetch remote changes and check the local branch contains
the remote branch ref, otherwise abort and print a hint how to pull and
update the branch.

This should add all check needed for the average failure case that may
lead to a weird state or creation of a local tag that may not be
pushable.

Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

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