Allowing multiple issue servers to be autolinked in the changeset view; linking is now contingent on issue_server_link, issue_pat and issue_prefix being defined; multiple servers can be used by specifying a common suffix on all the above variables, ie .. issue_server_link_1 issue_pat_1 issue_prefix_1 .. and .. issue_server_link_other issue_pat_other issue_prefix_other .. would be treated as two distinct servers, but .. issue_pat_thing .. would be ignored (since the other two requisite vars aren't present). This patch is backwards compatible with existing variables (as a suffix isn't needed).

"""
Various utilities to work with Python < 2.7.

Those utilities may be deleted once ``vcs`` stops support for older Python
versions.
"""
import sys


if sys.version_info >= (2, 7):
    unittest = __import__('unittest')
else:
    unittest = __import__('unittest2')