Fixes LP Bug# 955349 - No init file in compute tests

* Adds a dunderinit file to tempest/tests/compute to enable
  server addresses tests...

Change-Id: Iad3b7956f31fc5952831172d4b862d2a63aa631f
diff --git a/tempest/tests/compute/__init__.py b/tempest/tests/compute/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tempest/tests/compute/__init__.py