Register testr as a distutil entry point

pbr contains a testr distutil command, but since it isn't registered
as an entry-point, it won't get used. Also drive-by a fix to
coverage, where we go to the trouble of setting a variable, and then
not using it.

Change-Id: I2227adf3643ffe6bcece0c7d2127d23e20d52f7a

pbr/testr_command.py

@@ -125,7 +125,7 @@ class Testr(cmd.Command):
         # Use this as coverage package name
         if self.coverage_package_name:
             package = self.coverage_package_name
-        options = "--source %s --parallel-mode" % self.coverage_package_name
+        options = "--source %s --parallel-mode" % package
         os.environ['PYTHON'] = ("coverage run %s" % options)
         logger.debug("os.environ['PYTHON'] = %r", os.environ['PYTHON'])
 

setup.cfg

@@ -36,6 +36,8 @@ warnerrors = True
 [entry_points]
 distutils.setup_keywords =
     pbr = pbr.core:pbr
+distutils.commands =
+    testr = pbr.testr_command:Testr
 
 [build_sphinx]
 all_files = 1