Import localpaths in every __init__ at top of packages in tools/

[jdm]

dfeea56#diff-91a3a73ee529ef6adddf10e2e1d045afR16 broke Servo's manifest update tools with this error:

Traceback (most recent call last):
  File "./mach", line 93, in <module>
    main(sys.argv)
  File "./mach", line 23, in main
    mach = mach_bootstrap.bootstrap(topdir)
  File "/Users/servo/buildbot/slave/mac-nightly/build/python/mach_bootstrap.py", line 291, in bootstrap
    mach.load_commands_from_file(os.path.join(topdir, path))
  File "/Users/servo/buildbot/slave/mac-nightly/build/python/_virtualenv/lib/python2.7/site-packages/mach/main.py", line 265, in load_commands_from_file
    imp.load_source(module_name, path)
  File "/Users/servo/buildbot/slave/mac-nightly/build/python/servo/testing_commands.py", line 42, in <module>
    from update import updatecommandline
  File "/Users/servo/buildbot/slave/mac-nightly/build/tests/wpt/update/__init__.py", line 18, in <module>
    from wptrunner.update import setup_logging, WPTUpdate
  File "/Users/servo/buildbot/slave/mac-nightly/build/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/update/__init__.py", line 8, in <module>
    from update import WPTUpdate
  File "/Users/servo/buildbot/slave/mac-nightly/build/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/update/update.py", line 8, in <module>
    from .. import environment as env
  File "/Users/servo/buildbot/slave/mac-nightly/build/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/environment.py", line 12, in <module>
    from wptserve.handlers import StringHandler
  File "/Users/servo/buildbot/slave/mac-nightly/build/tests/wpt/web-platform-tests/tools/wptserve/wptserve/__init__.py", line 1, in <module>
    from .server import WebTestHttpd, WebTestServer, Router  # noqa: F401
  File "/Users/servo/buildbot/slave/mac-nightly/build/tests/wpt/web-platform-tests/tools/wptserve/wptserve/server.py", line 16, in <module>
    from .config import Config
  File "/Users/servo/buildbot/slave/mac-nightly/build/tests/wpt/web-platform-tests/tools/wptserve/wptserve/config.py", line 7, in <module>
    import sslutils
ImportError: No module named sslutils

I fixed it locally by adding the tools directory to the import path in our local code before importing from wptrunner, but it would be nice to not keep encountering problems like this.

[foolip]

@gsnedders this is marked urgent and assigned to you. Is it really urgent?

[jgraham]

It's no longer urgent, because #10850 landed which solves the underlying problem here. I am going to say that this is WONTFIX, in favour of reducing our dependence on localpaths (e.g. via #10888)