This change is fixing confusing name warning: [1].
./org.eclipse.jgit.test/tests.bzl:12: confusing-name:
Never use 'l', 'I', or 'O' as names (they're too easily confused
with 'I', 'l', or '0').
[1] https://github.com/bazelbuild/buildtools/blob/master/WARNINGS.md#confusing-name
Change-Id: Ic7df48c37dac4c95c593ac2203300d50acc9eaad