tests: adapt dch tests for older devscripts

Determine the default urgency level by determining the version number of
the dch tool from command line.

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
import_orig: test error paths of find_source
docs: improve docs on using upstream's git repo

The documentation on using upstream's git directly instead of tarballs
was very terse. Add a step by step guide on how to get started and
how to update to new upstream versions.
Document changes and release 0.6.9
Update copyright notice

Git-Dch: Ignore
config: Don't pull in config defaults twice

This would otherwise overwrite values set in the legacy config sections.

Closes: #733759
config: Don't pull in config defaults twice

This would otherwise overwrite values set in the legacy config sections.

Closes: #733759
Remove cover-min-percentage

It makes running single tests harder than necessary since it requires
the percentage also when using "nose <testname>".
import_dsc: Create missing debian branch with --create-missing-branches

Closes: #739888
git-import-dsc: Document --create-missing-branches
Document changes and release 0.6.10
Request verbose output on bug reports
Remove incorrect docs about multiple filter options

Closes: #718536
Fix config file name