message: checkout git repos using web URLs instead of ssh
  Makes it easier when cloning from an environment that has no ssh keys set up.
diff: @@ -74,45 +74,45 @@ uname = str(subprocess.check_output(["uname", "-s"])).rstrip()
  checkout_git(
  "llvm",
  - "ssh://git@github.com/apple/swift-llvm.git",
  + "https://github.com/apple/swift-llvm.git",
  "stable")
  checkout_git(
  "clang",
  - "ssh://git@github.com/apple/swift-clang.git",
  + "https://github.com/apple/swift-clang.git",
  "stable")
  -checkout_git("swift", "ssh://git@github.com/apple/swift.git", "master")
  -checkout_git("cmark", "ssh://git@github.com/apple/swift-cmark.git", "master")
  +checkout_git("swift", "https://github.com/apple/swift.git", "master")
  +checkout_git("cmark", "https://github.com/apple/swift-cmark.git", "master")
  checkout_git("ninja", "https://github.com/ninja-build/ninja.git", "master")
  checkout_git(
  "lldb",
  - "ssh://git@github.com/apple/swift-lldb.git",
  + "https://github.com/apple/swift-lldb.git",
  "master")
  if args.package:
  checkout_git(
  "llbuild",
  - "ssh://git@github.com/apple/swift-llbuild.git",
  + "https://github.com/apple/swift-llbuild.git",
  "master")
  checkout_git(
  "swiftpm",
  - "ssh://git@github.com/apple/swift-package-manager.git",
  + "https://github.com/apple/swift-package-manager.git",
  "master")
  checkout_git(
  "swift-corelibs-foundation",
  - "ssh://git@github.com/apple/swift-corelibs-foundation.git",
  + "https://github.com/apple/swift-corelibs-foundation.git",
  "master")
  checkout_git(
  "swift-corelibs-xctest",
  - "ssh://git@github.com/apple/swift-corelibs-xctest.git",
  + "https://github.com/apple/swift-corelibs-xctest.git",
  "master")
  checkout_git(
  "swift-integration-tests",
  - "ssh://git@github.com/apple/swift-integration-tests.git",
  + "https://github.com/apple/swift-integration-tests.git",
  "master")
  elif args.foundation:
  checkout_git(
  "swift-corelibs-foundation",
  - "ssh://git@github.com/apple/swift-corelibs-foundation.git",
  + "https://github.com/apple/swift-corelibs-foundation.git",
  "master")
  if args.update:
  