ENH: Update to newer third-party update script

Update to `update-common.sh` from commit `7134d5ebef` in

    https://gitlab.kitware.com/utils/git-import-third-party

Manually preserve ITK's change from commit 5dccc22 (BUG: Do not gpg
sign third party updates, 2018-11-19, v5.0b02~82^2~1).

Utilities/Maintenance/update-third-party.bash

@@ -42,6 +42,22 @@
 # For convenience, the function may use the "git_archive" function which
 # does a standard "git archive" extraction using the (optional) "paths"
 # variable to only extract a subset of the source tree.
+#
+# Dependencies
+#
+# To update third party packages from git repositories with submodule,
+# you will need to install the "git-archive-all" Python package with
+#
+#   pip install git-archive-all
+#
+# or install it from https://github.com/Kentzo/git-archive-all.
+#
+# This package installs a script named "git-archive-all" where pip
+# installs executables. If you run pip under your user privileges (i.e.,
+# not using "sudo"), this location may be $HOME/.local/bin. Make sure
+# that directory is in your path so that git can find the
+# "git-archive-all" script.
+#
 ########################################################################
 
 ########################################################################
@@ -52,11 +68,24 @@ git_archive () {
         tar -C "$extractdir" -x
 }
 
+confirm_archive_all_exists () {
+    which git-archive-all || die "git requires an archive-all command. Please run 'pip install git-archive-all'"
+}
+
+git_archive_all () {
+    confirm_archive_all_exists
+    local tmptarball="temp.tar"
+    git archive-all --prefix="" "$tmptarball"
+    mkdir -p "$extractdir/$name-reduced"
+    tar -C "$extractdir/$name-reduced" -xf "$tmptarball" $paths
+    rm -f "$tmptarball"
+}
+
 disable_custom_gitattributes() {
     pushd "${extractdir}/${name}-reduced"
     # Git does not allow custom attributes in a subdirectory where we
     # are about to merge the `.gitattributes` file, so disable them.
-    sed -i '/^\[attr\]/ {s/^/#/}' .gitattributes
+    sed -i '/^\[attr\]/ {s/^/#/;}' .gitattributes
     popd
 }
 
@@ -71,6 +100,9 @@ warn () {
 
 readonly regex_date='20[0-9][0-9]-[0-9][0-9]-[0-9][0-9]'
 readonly basehash_regex="$name $regex_date ([0-9a-f]*)"
+readonly toplevel_dir="$( git rev-parse --show-toplevel )"
+
+cd "$toplevel_dir"
 
 ########################################################################
 # Sanity checking
@@ -89,13 +121,13 @@ readonly basehash_regex="$name $regex_date ([0-9a-f]*)"
 # Check for an empty destination directory on disk.  By checking on disk and
 # not in the repo it allows a library to be freshly re-inialized in a single
 # commit rather than first deleting the old copy in one commit and adding the
-# new copy in a seperate commit.
+# new copy in a separate commit.
 if [ ! -d "$(git rev-parse --show-toplevel)/$subtree" ]; then
     readonly basehash=""
 else
     readonly basehash="$( git rev-list --author="$ownership" --grep="$basehash_regex" -n 1 HEAD )"
 fi
-readonly upstream_old_short="$( git cat-file commit "$basehash" | sed -n '/'"$basehash_regex"'/ {s/.*(//;s/)//;p}' | egrep '^[0-9a-f]+$' )"
+readonly upstream_old_short="$( git cat-file commit "$basehash" | sed -n '/'"$basehash_regex"'/ {s/.*(//;s/)//;p;}' | egrep '^[0-9a-f]+$' )"
 
 [ -n "$basehash" ] || \
     warn "'basehash' is empty; performing initial import"
@@ -111,7 +143,7 @@ readonly extractdir="$workdir/extract"
 trap "rm -rf '$workdir'" EXIT
 
 # Get upstream
-git clone "$repo" "$upstreamdir"
+git clone --recursive "$repo" "$upstreamdir"
 
 if [ -n "$basehash" ]; then
     # Remove old worktrees
@@ -120,7 +152,7 @@ if [ -n "$basehash" ]; then
     git worktree add "$extractdir" "$basehash"
     # Clear out the working tree
     pushd "$extractdir"
-    git ls-files | xargs rm -v
+    git ls-files -z --recurse-submodules | xargs -0 rm -v
     find . -type d -empty -delete
     popd
 else
@@ -132,6 +164,8 @@ fi
 # Extract the subset of upstream we care about
 pushd "$upstreamdir"
 git checkout "$tag"
+git submodule sync --recursive
+git submodule update --recursive --init
 readonly upstream_hash="$( git rev-parse HEAD )"
 readonly upstream_hash_short="$( git rev-parse --short=8 "$upstream_hash" )"
 readonly upstream_datetime="$( git rev-list "$upstream_hash" --format='%ci' -n 1 | grep -e "^$regex_date" )"