Use tempest.lib code in tempest

Now that tempest_lib code is copied back into tempest, stop using
tempest_lib in tempest, and start using the copied code.

Remove the dependency to tempest_lib from requirements, and drop
the script to use tempest_lib in tempest. Add os-testr to the
test-requirements.

Partially implements bp tempest-lib-reintegration

Change-Id: I21ab5fe6349f72c98ac9f960a29bf62e813f8b1b
diff --git a/setup.cfg b/setup.cfg
index cc3a365..0ddb898 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -32,6 +32,8 @@
     tempest-cleanup = tempest.cmd.cleanup:main
     tempest-account-generator = tempest.cmd.account_generator:main
     tempest = tempest.cmd.main:main
+    skip-tracker = tempest.lib.cmd.skip_tracker:main
+    check-uuid = tempest.lib.cmd.check_uuid:run
 tempest.cm =
     account-generator = tempest.cmd.account_generator:TempestAccountGenerator
     init = tempest.cmd.init:TempestInit