Remove custom hacking rules

The two hacking rules, no_log_warn and no_os_popen, have existed in base
nova for quite some time.  Removing them.

Change-Id: I95c7c3b80f3bbeaae931d6842959d89ad0442e30

nova_powervm/hacking/checks.py

@@ -17,29 +17,5 @@
 from nova.hacking import checks
 
 
-def no_log_warn(logical_line, filename):
-    """Disallow 'LOG.warn('
-
-    """
-    if logical_line.startswith('LOG.warn('):
-        yield(0, 'P301 Use LOG.warning() rather than LOG.warn()')
-
-
-def no_os_popen(logical_line):
-    """Disallow 'os.popen('
-
-    Deprecated library function os.popen() Replace it using subprocess
-    https://bugs.launchpad.net/tempest/+bug/1529836
-
-    P302
-    """
-
-    if 'os.popen(' in logical_line:
-        yield(0, 'P302 Deprecated library function os.popen(). '
-                 'Replace it using subprocess module. ')
-
-
 def factory(register):
-    register(no_log_warn)
-    register(no_os_popen)
     checks.factory(register)