dev-lang/python-exec: Rename the live ebuild to -9999 for consistency

diff --git a/dev-lang/python-exec/python-exec-2.9999.ebuild b/dev-lang/python-exec/python-exec-9999.ebuild
similarity index 100%
rename from dev-lang/python-exec/python-exec-2.9999.ebuild
rename to dev-lang/python-exec/python-exec-9999.ebuild