completion: prioritize ./git-completion.bash

To ease development, prioritize ./git-completion.bash over other
standard system paths.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
completion: introduce __gitcomp_2 ()

There are situations where two classes of completions possible. For
example

  branch.<TAB>

should try to complete

  branch.master.
  branch.autosetupmerge
  branch.autosetuprebase

The first candidate has the suffix ".", and the second/ third candidates
have the suffix " ". To facilitate completions of this kind, create a
variation of __gitcomp_nl () that accepts two sets of arguments and two
independent suffixes.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
completion: fix branch.autosetup(merge|rebase)

When attempting to complete

  $ git config branch.auto<TAB>

'autosetupmerge' and 'autosetuprebase' don't come up. This is because
"$cur" is matched with "branch.*" and a list of branches are
completed. Add 'autosetup(merge|rebase)' to the list of branches using
__gitcomp_2 ().

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
completion: fix remote.pushdefault

When attempting to complete

  $ git config remote.push<TAB>

'pushdefault' doesn't come up. This is because "$cur" is matched with
"remote.*" and a list of remotes are completed. Add 'pushdefault' to the
list of remotes using __gitcomp_2 ().

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>