message: Update gitmodules
  Update .gitmodules to use github.com/apache
diff: # The two httpds are the longest syncs, so we'd like to start them first.
  [submodule "third_party/httpd/src"]
  path = third_party/httpd/src
  - url = https://git.apache.org/httpd.git
  + url = https://github.com/apache/httpd.git
  [submodule "third_party/httpd24/src"]
  path = third_party/httpd24/src
  - url = https://git.apache.org/httpd.git
  + url = https://github.com/apache/httpd.git
  [submodule "third_party/brotli/src"]
  path = third_party/brotli/src
  url = https://github.com/google/brotli.git
  url = https://github.com/google/closure-library.git
  [submodule "third_party/aprutil/src"]
  path = third_party/aprutil/src
  - url = https://git.apache.org/apr-util.git
  + url = https://github.com/apache/apr-util.git
  [submodule "third_party/re2/src"]
  path = third_party/re2/src
  url = https://github.com/google/re2.git
  url = https://github.com/redis/hiredis.git
  [submodule "third_party/apr/src"]
  path = third_party/apr/src
  - url = https://git.apache.org/apr.git
  + url = https://github.com/apache/apr.git
  [submodule "third_party/optipng"]
  path = third_party/optipng
  url = https://github.com/apache/incubator-pagespeed-optipng.git
  url = https://chromium.googlesource.com/webm/libwebp.git
  [submodule "third_party/serf/src"]
  path = third_party/serf/src
  - url = https://git.apache.org/serf.git
  + url = https://github.com/apache/serf.git
  [submodule "third_party/grpc/src"]
  path = third_party/grpc/src
  url = https://github.com/grpc/grpc.git
  