installer: remove temporary directories if installer failed

[zprogd-zz]

Installer creates new installation directory for each new installation. At the end installer remove old directories. But if there were errors, for example package doesn't exist, installer doesn't remove new directory. That quickly leads to disk out of space.

[gonzus]

Proposed fix is on branch gonzo/rm_temp_dir_on_failure, 8f19ed0

Pull request is https://github.com/xsawyerx/pakket/pull/213

[gonzus]

I pushed my initial implementation, after what we discussed today. I admit I have not tested it... 91a5ad0

[zprogd-zz]

$ pakket install -vvvvv perl/Data-Visitor=0.26:1 

Error in tempdir() using /tmp/work_20029_1506931828.64577_XXXXX.tmp: The template must end with at least 4 'X' characters
 at /opt/pakket/local/lib/perl5/Path/Tiny.pm line 393.

[gonzus]

Doh. Fixed in the branch, still cannot run pakket locally (working on it).

[gonzus]

Fixed and tested. This also led me to find a bug in Path::Tiny, which I will report upstream.

[gonzus]

Reported upstream: dagolden/Path-Tiny#199.

[gonzus]

Since we can work around the "bug" I reported upstream, please feel free to check and merge https://github.com/xsawyerx/pakket/pull/226.