python3 compatibility: import proper modules

Some modules (httplib, StringIO, ...) were renamed in python3. This
patch try to import the proper symbols from python3 and then fallback to
python2 in a case ImportError will appear.

There is one exception, python 2.7 got the io module with StringIO, but
it allow unicode arguments only. Therefor the old module is poked before
new one.

osc/build.py

@@ -9,7 +9,11 @@ import os
 import re
 import sys
 import shutil
-import urlparse
+try:
+    from urllib.parse import urlsplit
+except ImportError:
+    #python 2.x
+    from urlparse import urlsplit
 from tempfile import NamedTemporaryFile, mkdtemp
 from osc.fetch import *
 from osc.core import get_buildinfo, store_read_apiurl, store_read_project, store_read_package, meta_exists, quote_plus, get_buildconfig, is_package_dir
@@ -491,7 +495,7 @@ def main(apiurl, opts, argv):
                 opts.local_package = True
         if opts.local_package:
             pacname = os.path.splitext(build_descr)[0]
-    apihost = urlparse.urlsplit(apiurl)[1]
+    apihost = urlsplit(apiurl)[1]
     if not build_root:
         try:
            build_root = config['build-root'] % {'repo': repo, 'arch': arch,