[vault] fix in options processing

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[vault] try to checkout master if there is no achor file

It can be when .git is appeared as the result of reconstruction

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
Merge pull request #5 from deztructor/master

Improvements in repository state handling