travisci: fix UnicodeEncodeError in gbp 0.9.8
travisci: fix UnicodeEncodeError in gbp 0.9.8

Upstream git-buildpackage commit
4424008f6aaa7ce93d02f0c4948ad50542284ece fixed this.

Upstream git-buildpackage commit
23874c2c50ebd57426797d38f4f9c6c40dc336ec added the umlaut back in. 0.9.8
was tagged with this change.

This causes "setup.py install" to fail for git-buildpackage 0.9.8

Upstream git-buildpackage commit
ba32efc1af9e893041dc1752008329b383986786 drops the umlaut in this file
again.

Drop the problematic umlaut character ourselves, since we're testing
0.9.8 in Travis CI.

red-hat-storage/rhcephpkg,red-hat-storage/rhcephpkg