git: Add RelativePath function

Might be handy in the future, so let's keep it there...

Change-Id: dec3471405
config: Read config files synchronously

Up until now the reading was concurrent, one thread for every file.
There is, however, little gain in doing so for two files, so this patch
makes the code easier to read while dropping concurrency.

Change-Id: 28e8476df4
wip

Change-Id: 06c9d9982e
Story-Id: SF-6
wip

Change-Id: 6be6e13ae0
Story-Id: SF-6
wip

Change-Id: f961f519a5
Story-Id: SF-6
wip

Change-Id: d3a353bf2c
Story-Id: SF-6
wip

Change-Id: 85fa888ed4
Story-Id: SF-6
wip

Change-Id: 5e2c30383d
Story-Id: SF-6
wip

Change-Id: 169450a245
Story-Id: SF-6