feat(bao): add 3rd party fallback completion loader

https://github.com/openbao/openbao

Author: scop

completions/.gitignore

@@ -28,6 +28,7 @@
 /autoupdate
 /avahi-browse-domains
 /b2sum
+/_bao
 /_black
 /_blackd
 /bmake

completions/Makefile.am

@@ -546,6 +546,7 @@ CLEANFILES = \
 	autossh \
 	autoupdate \
 	avahi-browse-domains \
+	_bao \
 	_black \
 	_blackd \
 	bmake \
@@ -1207,7 +1208,7 @@ symlinks: $(DATA)
 	$(ss) update-alternatives \
 		alternatives
 	$(ss) _vault \
-		_consul _nomad _packer _terraform
+		_bao _consul _nomad _packer _terraform
 	$(ss) vipw \
 		vigr
 	$(ss) vncviewer \