Remove using of deprecated self.headers (part1)

Attr self.headers in rest client is deprecated now, and
should be removed from usage by service clients.

This patch removes first bunch of attrs.
Second and last part is intended to be in another patch,
with removing from all other service clients
and from rest client itself.

Change-Id: I28981738a9e7f39343cf530c2642315f0a5b22f2
Partially-implements: bp refactor-rest-client
diff --git a/tempest/services/baremetal/base.py b/tempest/services/baremetal/base.py
index 6e86466..5f6b513 100644
--- a/tempest/services/baremetal/base.py
+++ b/tempest/services/baremetal/base.py
@@ -114,7 +114,7 @@
         """
         uri = self._get_uri(resource, permanent=permanent)
 
-        resp, body = self.get(uri, self.headers)
+        resp, body = self.get(uri)
 
         return resp, self.deserialize(body)
 
@@ -127,7 +127,7 @@
 
         """
         uri = self._get_uri(resource, uuid=uuid, permanent=permanent)
-        resp, body = self.get(uri, self.headers)
+        resp, body = self.get(uri)
 
         return resp, self.deserialize(body)
 
@@ -145,7 +145,7 @@
         body = self.serialize(object_type, object_dict)
         uri = self._get_uri(resource)
 
-        resp, body = self.post(uri, headers=self.headers, body=body)
+        resp, body = self.post(uri, body=body)
 
         return resp, self.deserialize(body)
 
@@ -160,7 +160,7 @@
         """
         uri = self._get_uri(resource, uuid)
 
-        resp, body = self.delete(uri, self.headers)
+        resp, body = self.delete(uri)
         return resp, body
 
     def _patch_request(self, resource, uuid, patch_object):
@@ -176,7 +176,7 @@
         uri = self._get_uri(resource, uuid)
         patch_body = json.dumps(patch_object)
 
-        resp, body = self.patch(uri, headers=self.headers, body=patch_body)
+        resp, body = self.patch(uri, body=patch_body)
         return resp, self.deserialize(body)
 
     @handle_errors