OS-1823 git-pbchk should not depend on mercurial

*** 14,23 ****
--- 14,24 ----
  #
  
  #
  # Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  # Copyright 2008, 2011 Richard Lowe
+ # Copyright (c) 2013, Joyent Inc. All rights reserved.
  #
  
  '''OpenSolaris extensions to Mercurial
  
      This extension contains a number of commands to help you work with
*** 90,107 ****
  # within the source tree.
  #
  sys.path.insert(2, os.path.join(os.path.dirname(__file__), "..", ".."))
  
  from onbld.Scm import Version
  from mercurial import util
  
  try:
      Version.check_version()
  except Version.VersionMismatch, badversion:
      raise util.Abort("Version Mismatch:\n %s\n" % badversion)
  
! from mercurial import cmdutil, ignore, node, patch
  
  from onbld.Scm.WorkSpace import WorkSpace, WorkList
  from onbld.Scm.Backup import CdmBackup
  from onbld.Checks import Cddl, Comments, Copyright, CStyle, HdrChk
  from onbld.Checks import JStyle, Keywords, Mapfile
--- 91,109 ----
  # within the source tree.
  #
  sys.path.insert(2, os.path.join(os.path.dirname(__file__), "..", ".."))
  
  from onbld.Scm import Version
+ from onbld.Scm import Ignore
  from mercurial import util
  
  try:
      Version.check_version()
  except Version.VersionMismatch, badversion:
      raise util.Abort("Version Mismatch:\n %s\n" % badversion)
  
! from mercurial import cmdutil, node, patch
  
  from onbld.Scm.WorkSpace import WorkSpace, WorkList
  from onbld.Scm.Backup import CdmBackup
  from onbld.Checks import Cddl, Comments, Copyright, CStyle, HdrChk
  from onbld.Checks import JStyle, Keywords, Mapfile
*** 165,175 ****
                 repo.wjoin('exception_lists/%s' % cmd)]:
          if os.path.exists(f):
              ignorefiles.append(f)
  
      if ignorefiles:
!         ign = ignore.ignore(repo.root, ignorefiles, repo.ui.warn)
          return canonified_check(ign)
      else:
          return util.never
  
  
--- 167,177 ----
                 repo.wjoin('exception_lists/%s' % cmd)]:
          if os.path.exists(f):
              ignorefiles.append(f)
  
      if ignorefiles:
!         ign = Ignore.ignore(repo.root, ignorefiles)
          return canonified_check(ign)
      else:
          return util.never