Add kolla-ansible bash completion script

Make command line more friendly. :)

Change-Id: I8113c72aa00b1c07cb2b77c73e7dd8c7ee833bcc

contrib/bash-completion/kolla-ansible

+_kolla_ansible() {
+    local cur prev opts
+
+    COMPREPLY=()
+
+    cur="${COMP_WORDS[COMP_CWORD]}"
+    prev="${COMP_WORDS[COMP_CWORD-1]}"
+    kolla_ansible_opts="$(kolla-ansible bash-completion)"
+    kolla_ansible_flags="$(echo ${kolla_ansible_opts} | sed 's/ [^-][a-z0-9_-]*//g' )"
+    kolla_ansible_actions="$(echo ${kolla_ansible_opts} | sed 's/--[a-z0-9-]*//g' | sed 's/ -[a-z]//g' )"
+
+    if [[ ${cur} == -* ]] ; then
+        COMPREPLY=( $(compgen -W "${kolla_ansible_flags}" -- ${cur}) )
+        return 0
+    else
+        COMPREPLY=( $(compgen -W "${kolla_ansible_actions}" -- ${cur}) )
+        return 0
+    fi
+}
+
+complete -F _kolla_ansible -A file kolla-ansible

releasenotes/notes/add-kolla-ansible-bash-completion-script-74d39268a829e1a2.yaml

+---
+features:
+  - Add kolla-ansible bash-completion script under
+    contrib/bash-completion folder.

tools/kolla-ansible

@@ -64,6 +64,34 @@ Commands:
 EOF
 }
 
+function bash_completion {
+cat <<EOF
+--inventory -i
+--playbook -p
+--configdir
+--key -k
+--help -h
+--tags -t
+--extra -e
+--passwords
+--verbose -v
+prechecks
+check
+mariadb_recovery
+bootstrap-servers
+destroy
+deploy
+deploy-bifrost
+deploy-servers
+post-deploy
+pull
+reconfigure
+stop
+certificates
+upgrade
+genconfig
+EOF
+}
 
 SHORT_OPTS="hi:p:t:k:e:v"
 LONG_OPTS="help,inventory:,playbook:,tags:,key:,extra:,verbose,configdir:,passwords:,yes-i-really-really-mean-it,include-images"
@@ -233,6 +261,10 @@ EOF
         ACTION="Generate configuration files for enabled OpenStack services"
         EXTRA_OPTS="$EXTRA_OPTS -e action=config"
         ;;
+(bash-completion)
+        bash_completion
+        exit 0
+        ;;
 (*)     usage
         exit 0
         ;;