drop pyversion & is_python3 checking

We're committed to Python 3 at this point, so purge all the
is_python3 related dynamic checks.

Bug: https://crbug.com/gerrit/10418
Change-Id: I4c8b405d6de359b8b83223c9f4b9c8ffa18ea1a2
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/292383
Reviewed-by: Chris Mcdonald <cjmcdonald@google.com>
Tested-by: Mike Frysinger <vapier@google.com>

subcmds/sync.py

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import http.cookiejar as cookielib
 import json
 import netrc
 from optparse import SUPPRESS_HELP
@@ -22,26 +23,10 @@ import subprocess
 import sys
 import tempfile
 import time
-
-from pyversion import is_python3
-if is_python3():
-  import http.cookiejar as cookielib
-  import urllib.error
-  import urllib.parse
-  import urllib.request
-  import xmlrpc.client
-else:
-  import cookielib
-  import imp
-  import urllib2
-  import urlparse
-  import xmlrpclib
-  urllib = imp.new_module('urllib')
-  urllib.error = urllib2
-  urllib.parse = urlparse
-  urllib.request = urllib2
-  xmlrpc = imp.new_module('xmlrpc')
-  xmlrpc.client = xmlrpclib
+import urllib.error
+import urllib.parse
+import urllib.request
+import xmlrpc.client
 
 try:
   import threading as _threading