Remove deprecated find_test_caller function

This patchset removes the long-ago deprecated version of
find_test_caller in ``tempest.lib.common.utils.misc.find_test_caller``
which was deprecated during Kilo release cycle in favor of
``tempest.lib.common.utils.test_utils.find_test_caller`` [0].

There are a few projects that depend on the old find_test_caller
for which patchsets have been submitted to change to the
non-deprecated version: [1][2].

Only remaining place is in openstack/tempest-lib which no longer
appears to be supported (no activity in a few years) [3].

[0] http://git.openstack.org/cgit/openstack/tempest/tree/releasenotes/notes/12/12.1.0-new-test-utils-module-adf34468c4d52719.yaml
[1] https://review.openstack.org/#/c/578166/
[2] https://review.openstack.org/#/c/578168/
[3] e.g. http://git.openstack.org/cgit/openstack/tempest-lib/tree/tempest_lib/common/utils/misc.py

Change-Id: I64253af8eb401238aba254d1887d748a68cf32d3

releasenotes/notes/remove-deprecated-find-test-caller-f4525cd043bfd1b6.yaml

@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    ``tempest.lib.common.utils.misc.find_test_caller`` was deprecated during
+    Kilo release cycle in favor of
+    ``tempest.lib.common.utils.test_utils.find_test_caller``. The deprecated
+    version of ``find_test_caller`` is removed.

tempest/lib/common/utils/misc.py

@@ -14,8 +14,6 @@
 #    under the License.
 from oslo_log import log as logging
 
-from tempest.lib.common.utils import test_utils
-
 LOG = logging.getLogger(__name__)
 
 
@@ -28,10 +26,3 @@ def singleton(cls):
             instances[cls] = cls()
         return instances[cls]
     return getinstance
-
-
-def find_test_caller(*args, **kwargs):
-    LOG.warning("tempest.lib.common.utils.misc.find_test_caller is deprecated "
-                "in favor of tempest.lib.common.utils.test_utils."
-                "find_test_caller")
-    test_utils.find_test_caller(*args, **kwargs)