Fix renewing expired FILE ccache

[msimacek]

Renewing expired FILE ccache didn't work because krbcontext created an empty file for the ccache, but kerberos considered an empty file invalid.

Fix this by creating a temporary directory and letting kerberos create the ccache file by itself (which is a perfectly valid scenario). Also add cleanup for the temporary dir and fix the directory naming.

Fixes #23

[codecov-io]

Codecov Report

Merging #24 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #24   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines         110    109    -1     
=====================================
- Hits          110    109    -1

Impacted Files	Coverage Δ
krbcontext/context.py	100% <100%> (ø)	:arrow_up:

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[tkdchen]

Thank you very much.

[msimacek]

Would you mind making a new release?

[tkdchen]

Hi @msimacek, I'm preparing a new release. It'll be available soon. BTW, from where do you install krbcontext, PyPI or some Linux distro package repositories like Fedora repos? Generally, a new release is published to PyPI. If you are expecting krbcontext is installable from Linux package repositories, I can build the package as well. Currently, it is in Fedora and EPEL repos.

[msimacek]

We were previously building our own RPMS from the release tarball, but soon we'll switch to using PyPI. Thank you

[tkdchen]

@msimacek Hi, new release is avaialble in PyPI already.