Fix unrecognized --limit option

Kolla-ansible does not have as its allowed parameters
ansible's limit.

Change-Id: I86821fe39e6f0f61e513a0677bf177234c203103
Closes-Bug: #1693801

tools/kolla-ansible

@@ -42,6 +42,7 @@ Options:
     --tags, -t <tags>                  Only run plays and tasks tagged with these values
     --extra, -e <ansible variables>    Set additional variables as key=value or YAML/JSON passed to ansible-playbook
     --passwords <passwords_path>       Specify path to the passwords file
+    --limit <host>                     Specify host to run plays
     --verbose, -v                      Increase verbosity of ansible-playbook
 
 Commands:
@@ -74,6 +75,7 @@ cat <<EOF
 --tags -t
 --extra -e
 --passwords
+--limit
 --verbose -v
 prechecks
 check
@@ -94,7 +96,7 @@ 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"
+LONG_OPTS="help,inventory:,playbook:,tags:,key:,extra:,verbose,configdir:,passwords:,limit:,yes-i-really-really-mean-it,include-images"
 ARGS=$(getopt -o "${SHORT_OPTS}" -l "${LONG_OPTS}" --name "$0" -- "$@") || { usage >&2; exit 2; }
 
 eval set -- "$ARGS"
@@ -165,6 +167,11 @@ while [ "$#" -gt 0 ]; do
             PASSWORDS_FILE="$2"
             shift 2
             ;;
+    (--limit)
+            EXTRA_OPTS="$EXTRA_OPTS --limit $2"
+            shift 2
+            ;;
+
     (--help|-h)
             usage
             shift