oe-selftest: renamed sstate.py module to sstatetests.py

Signed-off-by: Corneliu Stoicescu <corneliux.stoicescu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/lib/oeqa/selftest/sstate.py b/meta/lib/oeqa/selftest/sstatetests.py
similarity index 100%
rename from meta/lib/oeqa/selftest/sstate.py
rename to meta/lib/oeqa/selftest/sstatetests.py