Query the container for the full path of the parallel R .rdx file to the .rdb file as well as looking in the same directory. This ensures that comparing two .deb/.changes shows a varying path mostly introduced in f1e80ca2.

Gbp-Dch: ignore

Gbp-Dch: ignore

When formatting command lines for display (eg. as sources of data) ensure newlines and other metacharacters appear escaped as "\n", etc.

Rework and refactor the handling of R .rdb files with respect to locating the parallel .rdx prior to inspecting the file to ensure that we do not add files to the user's filesystem in the case of directly comparing two .rdb files or, worse, overwriting a file in is place.

To match the libarchive container, raise a KeyError exception if we request an invalid member from a directory container.

Correct string representation output in the traceback when we cannot locate a specific item in a container.

Move build-dependency on python-argcomplete to the Python 3.x version to facilitate Python 2.x removal. (Closes: #942967)

Also move from the deprecated ADTTMP to AUTOPKGTEST_TMP.

Signed-off-by: Mattia Rizzolo <mattia@debian.org>

Gbp-Dch: ignore

Gbp-Dch: ignore

This adds a "Missing-Python-Modules" entry to the output of
--list-missing-tools, for example:

```
  Missing-Python-Modules: PyPDF2, argcomplete, defusedxml, guestfs, jsondiff, progressbar, rpm
```

Signed-off-by: Chris Lamb <lamby@debian.org>

Signed-off-by: Mattia Rizzolo <mattia@debian.org>

Gbp-Dch: ignore

Gbp-Dch: ignore