t/coverage.sh: Reset files not part of the tarball.
t/coverage.sh: Reset files not part of the tarball.

This way, files like .gitignore and .travis.yml, which are not part of a
release, are reset and will not cause a "dirty" version.

sysdb/sysdb,sysdb/sysdb,tokkee/sysdb,tokkee/sysdb,tokkee/sysdb,sysdb/sysdb