Rename tests

diff --git a/t/count/count_distinct.t b/t/count/distinct.t
similarity index 100%
rename from t/count/count_distinct.t
rename to t/count/distinct.t

diff --git a/t/count/count_joined.t b/t/count/joined.t
similarity index 100%
rename from t/count/count_joined.t
rename to t/count/joined.t