TT#63758 Add 'push-parallel' action in ngcpcfg and manuals

Change-Id: Ib560b28d14bb75c9817894350cd14fbd3614a350

docs/ngcpcfg.txt

@@ -443,6 +443,21 @@ as argument then the changes will be pushed to the shared repository and to the
 given hosts only. If no host has been specified then the hosts specified in
 _/etc/ngcp-config/systems.cfg_ are used. The magic word 'all' can be used as a 'host'
 to push the changes on all the nodes from the network.yml except the local one.
+Note: This option is available in the High Availability setup only.
+
+  **push-parallel** [--apply-on-all-nodes] [<host(s)>]::
+
+Like the action 'push' above, action 'push-parallel' pushes modifications to the
+shared repository and remote systems _in parallel_. After the changes have been
+pushed to the nodes the _apply_ operation will be executed on the remote systems
+to rebuild the configuration files. All the actions are only performed on HA inactive
+nodes (unless the option '--apply-on-all-nodes' is specified).
+If one or multiple hostnames or IP addresses are given as arguments then the
+changes will be only pushed to the shared repository and the actions performed
+only on the given hosts.
+If no hosts have been specified then the 'push' will hapen to all HA inactive nodes.
+All 'ngcpcfg' output is muted on STDOUT but available in the log file
+'/var/log/ngcp/ngcpcfg-parallel.log' on each node.
 Note: This option is available in the High Availability setup only.
 
   **services** [--dry-run]::

sbin/ngcpcfg

@@ -64,7 +64,8 @@ Actions:
 
   # display only if ngcp-ngcpcfg-ha is available
   if [ -r /usr/share/ngcp-ngcpcfg/functions/ha_features ] ; then
-    printf "  push [<opts>]       push modifications to other systems (shared storage setup only)\n"
+    printf "  push [<opts>]       push modifications to other node(s) (shared storage setup only)\n"
+    printf "  push-parallel       push modifications to other node(s) in parallel (shared storage setup only)\n"
     printf "  pull                retrieve modifications from shared storage (shared storage setup only)\n"
   fi
 
@@ -151,6 +152,7 @@ case ${1:-} in
   log|\
   pull|\
   push|\
+  push-parallel|\
   services|\
   status|\
   set|\