Update git submodules

* Update cookiecutter from branch 'master'
  - Fix outdated references to git.openstack.org/cgit/
    
    This is a follow-on from the previous OpenDev migration patch,
    which catches a few remaining references to cgit, and changes
    them to point to the new opendev.org gitea instance.
    
    Change-Id: I64d2d840073e6fa0e6af08ca950b32c8fe248e37
    
  - OpenDev Migration Patch
    
    This commit was bulk generated and pushed by the OpenDev sysadmins
    as a part of the Git hosting and code review systems migration
    detailed in these mailing list posts:
    
    http://lists.openstack.org/pipermail/openstack-discuss/2019-March/003603.html
    http://lists.openstack.org/pipermail/openstack-discuss/2019-April/004920.html
    
    Attempts have been made to correct repository namespaces and
    hostnames based on simple pattern matching, but it's possible some
    were updated incorrectly or missed entirely. Please reach out to us
    via the contact information listed at https://opendev.org/ with any
    questions you may have.
    
  - Update contact address to openstack-discuss ML
    
    The openstack-dev mailing list has been retired and its
    conversations now take place on openstack-discuss instead.
    
    http://lists.openstack.org/pipermail/openstack-dev/2018-November/136501.html
    
    Update this cookiecutter so that new projects don't copy over the
    obsolete ML name.
    
    Change-Id: Idadd91db3ea68bc0b62616640a98f60e283d1a73
    
  - Update the outdated URL in README.rst
    
    Change-Id: I613b9d5f1ac3f599a38dc648daad70de9864460f
    
  - Clean up .gitignore references to personal tools
    
    Developers run all sorts of different tools within Git repositories,
    any of which can leave their own special trashfiles all over the
    place. We can't every hope to catalog them all, so better to
    recommend developers simply configure a global core.excludesfile to
    filter the irrelevant files which tend to get created by their
    personal choice of tools.
    
    To this end, remove the long-standing sections for "Mr Developer"
    and "Editors" since their mere existence here sends the signal that
    we welcome (and have time to review) additions for any old tool
    someone ever might happen to try. Also add a comment block
    explaining this, for clarity.
    
    We can, and should of course, continue to list files created by the
    tools recommended by our workflow (test frameworks called from tox,
    documentation and packaging builds, et cetera).
    
    Change-Id: Ib58a57267b064e4142686de6c37a70dbff04b9a7
    
  - Merge "Convert to new docs PTI"
  - Convert to new docs PTI
    
    https://governance.openstack.org/tc/reference/project-testing-interface.html
    
    Change-Id: I1f6debad924f68f6d0bf6fc04113614ef4b7a0b0
    
  - Merge "Fix quotes and undefined variable"
  - Fixed two issues regarding cookiecutter template
    
    - cookiecutter.json was using single quotes which is not JSON valid
    - there was a typo in CONTRIBUTING.rst:
       "cookiebutter" instead of "cookiecutter"
    
    Change-Id: I102b31b8152d2c9f2af8bbd3fca555eae50b3b42
    
  - Fix quotes and undefined variable
    
    Replace single quotes for double ones in cookiecutter.json,
    otherwise it leads to a decoding error.
    Fix a typo in a variable name.
    
    Change-Id: Iccc74d1d9a3d6b9757476adde4418d81e215152a
    
  - Add support for storyboard
    
    Also, add html_last_updated_fmt, which openstackdocstheme has been
    adding to everything.
    
    Change-Id: Ie3f8f4f095c4244c51615c9dcfd903305a02f017

cookiecutter

@@ -1 +1 @@
-Subproject commit b73d89dc9f212ebae077e090484a4658b455d412
+Subproject commit 3acc743d843184f0fb5d1f49d3e534a59935abaa