Add profiling support to designateclient

To be able to create profiling traces for Designate, client should
be able to send special HTTP header that contains trace info.

Don't worry no security issue here, trace information is signed by HMAC
key that is setted in api-paste.ini. So only person that knows HMAC key
is able to send proper header.

Main patch (in Designate) is:
https://review.opendev.org/c/openstack/designate/+/773574

Change-Id: I4b84ac1a5d4f84da3a38e4e0cb0990a54c6044ef

designateclient/v2/client.py

@@ -31,6 +31,9 @@ from designateclient.v2.zones import ZoneExportsController
 from designateclient.v2.zones import ZoneImportsController
 from designateclient.v2.zones import ZoneTransfersController
 from designateclient import version
+from oslo_utils import importutils
+
+osprofiler_web = importutils.try_import("osprofiler.web")
 
 
 class DesignateAdapter(adapter.LegacyJsonAdapter):
@@ -78,6 +81,9 @@ class DesignateAdapter(adapter.LegacyJsonAdapter):
         kwargs['headers'].setdefault(
             'Content-Type', 'application/json')
 
+        if osprofiler_web:
+            kwargs['headers'].update(osprofiler_web.get_trace_id_headers())
+
         response, body = super(self.__class__, self).request(*args, **kwargs)
 
         # Decode is response, if possible

lower-constraints.txt

@@ -41,6 +41,7 @@ oslo.log==3.36.0
 oslo.serialization==2.18.0
 oslo.utils==3.33.0
 oslotest==3.2.0
+osprofiler==3.4.0
 paramiko==2.0.0
 pbr==2.0.0
 prettytable==0.7.2