Cleaned up the requirements of Ironic Tempest plugin

* Removed unnecessary test-requirements since tempest plugin
  contains integration tests not unit tests.

Change-Id: If1c32967b5aafc70840861b28639fee3e9a03561
diff --git a/requirements.txt b/requirements.txt
index 1a62d2e..03e9914 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,10 @@
 # process, which may cause wedges in the gate later.
 
 pbr>=1.8 # Apache-2.0
+oslo.config>=5.1.0 # Apache-2.0
+oslo.log>=3.30.0 # Apache-2.0
+oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
+oslo.utils>=3.33.0 # Apache-2.0
+fixtures>=3.0.0 # Apache-2.0/BSD
+six>=1.10.0 # MIT
+tempest>=17.1.0 # Apache-2.0