Update git submodules

* Update swift from branch 'master'
  to 2d7c1dc6dd8a672c1f89a46b2423898d33ff63d2
  - CI: Fix our usage of tox
    
    For tox 3.x and earlier, passenv was a space-separated list; as of tox
    4.0.0, it's comma-separated. For a while, our spaces would be silently
    included in the now-one-and-only passenv value parsed (which wasn't
    great, but mostly just caused confusion) -- as of tox 4.0.6, however, it
    became a hard error, and all tests would fail like
    
      pass_env values cannot contain whitespace, use comma to have multiple
      values in a single line, invalid values found 'SWIFT_* *_proxy'
    
    Unfortunately, we don't really know what versions of tox all our various
    stakeholders might want/need to use (though we previously set a
    minversion of 2.3.2). We might be able to spread values over multiple
    lines to make it compatible with both tox 3 *and* tox 4, but I'm fairly
    certain *_proxy was only included for some variables that are recent
    versions of tox include by default anyway, so just increase our
    minversion (which was too low, anyway -- allowlist_externals which we
    already configure was added in 3.18.0) and get rid of *_proxy.
    
    FWIW, python-swiftclient was already specifying 3.18.0 as a minversion,
    so I expect the new minversion to not be a problem.
    
    Also, add ./.functests to a bunch of allowlist_externals, as newer tox
    is more strict about that sort of thing.
    
    Drop skipsdist in a bunch of places so we can import swift from func
    tests and docs. (Still not sure why I don't see us hitting a similar
    problem for unit tests...)
    
    Change-Id: I4be1e86e3291ad1619c695fb93d7cadf053b556d

swift

@@ -1 +1 @@
-Subproject commit 0c18b2d32910d507203b72c78fbcef8089ab9e5c
+Subproject commit 2d7c1dc6dd8a672c1f89a46b2423898d33ff63d2