BF: process included files before the rest

[yarikoptic]

Alternative solution to #628 - may be I have missed why it was more complex than 1 line change? ;)

• Closes Configparser does not respect order of config files with includes #627
• includes test
• also some minor refactoring to tests.lib to provide SkipTest, and skipIf

It also includes disabled (well -- raises SkipTest) for the fact that in current logic processing of included files is done not right at the point of inclusion. That makes it behave differently from stock git config

[codecov-io]

Codecov Report

Merging #700 into master will increase coverage by 1.82%.
The diff coverage is 93.24%.

@@            Coverage Diff             @@
##           master     #700      +/-   ##
==========================================
+ Coverage   92.83%   94.65%   +1.82%     
==========================================
  Files          61       60       -1     
  Lines       10152     9344     -808     
==========================================
- Hits         9425     8845     -580     
+ Misses        727      499     -228

Impacted Files	Coverage Δ
git/test/test_submodule.py	99.23% <ø> (+1.71%)	⬆️
git/refs/log.py	93.84% <0%> (ø)	⬆️
git/repo/base.py	95.96% <0%> (+0.67%)	⬆️
git/config.py	92.76% <100%> (+0.32%)	⬆️
git/test/test_util.py	98.52% <100%> (+10.29%)	⬆️
git/diff.py	99.11% <100%> (ø)	⬆️
git/exc.py	96.42% <100%> (ø)	⬆️
git/test/test_config.py	98.33% <100%> (+0.08%)	⬆️
git/compat.py	65.03% <100%> (+0.21%)	⬆️
git/test/test_commit.py	100% <100%> (ø)	⬆️
... and 22 more

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[yarikoptic]

I guess I will wait for #702 to be merged first so we could get travis pass here as well

[Byron]

@yarikoptic As always, thanks so much for chiming in :)! I merged the referenced 'make travis happy' branch in, and it seems to work just fine.