[maven-release-plugin] prepare release git-client-1.13.0
[maven-release-plugin] prepare for next development iteration
Allow multiple expected log substrings in credentials test

Safety check that the fetch (which requires permissions) did not hang
and was not killed by a timeout.
Use equals() rather than == to compare string in test
Do not interactively ask for a password

Replace the checkCredentials function with the native core.askpass=true git config variable.
Remove obsolete CliGitAPIImpl.checkCredentials()
Adapt CredentialsTest to askpass improvement
Merge branch 'master' into master-fix-javadoc-for-java-8