initial version of apt-helper
releasing package apt version 0.9.15.5
l10n: vi.po (624t): Update Vietnamese translation

Signed-off-by: Trần Ngọc Quân <vnwildman@gmail.com>
Merge remote-tracking branch 'upstream/debian/sid' into feature/apt-download-file

Conflicts:
	cmdline/apt-helper.cc
	test/integration/framework
	test/integration/test-apt-https-no-redirect