tests: fix negated test_i18ngrep calls

The helper function test_i18ngrep pretends that it found the expected
results when it is running under GETTEXT_POISON. For this reason, it must
not be used negated like so

   ! test_i18ngrep foo bar

because the test case would fail under GETTEXT_POISON. The function offers
a special syntax to test that a pattern is *not* found:

   test_i18ngrep ! foo bar

Convert incorrect uses to this syntax.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Git 2.1

Signed-off-by: Junio C Hamano <gitster@pobox.com>
dumpstat

This is still a WIP. It's approaching its final form, but it
could use documentation, and might need some tweaks as more
users are added.
dumpstat to fd

Like file, but probably more useful if you are a UI trying
to stream.
dumpstat-ify upload-pack
zeromq dumpstat implementation

This tries to do as little as possible on top of zeromq,
which might not work. It sends an "id" field with each
message to keep some state. Probably this should be
inherited through the environment.