tests/test-extension.out

replace usage of os.popen() with util.popen()

To make this possible, I added a mode parameter to both implementations of
util.popen(), defaulting to 'r' (as it does in the Python stdlib).

uisetup called
ui.parentui isnot None
reposetup called for a
ui == repo.ui
Foo
uisetup called
ui.parentui is None
reposetup called for a
ui == repo.ui
reposetup called for b
ui == repo.ui
updating working directory
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
uisetup called
ui.parentui is None
Bar
% module/__init__.py-style
uisetup called
ui.parentui isnot None
reposetup called for a
ui == repo.ui
Foo
empty extension - empty cmdtable

no commands defined
debugextension extension - only debugcommands

no commands defined
debugextension extension - only debugcommands

list of commands:

 debugfoobar:
      yet another debug command

global options:
 -R --repository      repository root directory or symbolic path name
    --cwd             change working directory
 -y --noninteractive  do not prompt, assume 'yes' for any required answers
 -q --quiet           suppress output
 -v --verbose         enable additional output
    --config          set/override config option
    --debug           enable debugging output
    --debugger        start debugger
    --encoding        set the charset encoding (default: ascii)
    --encodingmode    set the charset encoding mode (default: strict)
    --lsprof          print improved command execution profile
    --traceback       print traceback on exception
    --time            time how long the command takes
    --profile         print command execution profile
    --version         output version information and exit
 -h --help            display help and exit