[issue14061] Misc fixes and cleanups in archiving code in shutil and test_shutil

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Most of issues are already fixed. Proposed patch fixes remnants:

* You see a skip message when bz2 or lzma are not available, instead of silent non-testing.

* Removed a code that handles zipfile import failure. Importing zipfile now is always successful.

* The gztar and zip formats now are registered and supported only when zlib is available. This is documented now.

* Broken circular dependency between shutil and tarfile.

* Removed outdated sentences about the InfoZIP "zip" utility.

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keywords: +patch
stage:  -> patch review
versions: +Python 3.6
Added file: http://bugs.python.org/file41023/shutil_make_archive_misc.patch

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