Echo command

[umputun]

This is a new command, echo. The only goal is to print something to the normal (i.e. non- verbose and non-debug) log. This command is a little bit redundant; currently, it is possible to do just echo in a script and see the output in -v mode. However, there are use cases where such output is an essential result from the playbook execution, for example, if the playbook made a new resource, like an instance or volume and we need to inform the user what is ip/id of the new resource. For cases like this, I don't want to hide this info behind -v flag.

The echo command is echo and it is the lowest priority match, i.e. all the existing command will match first before we try to recognize echo. In the playbook, this command is as simple as this:

- name: show things
   echo: something blah $foo $bar

the command is not just printing things directly, it actually runs sh -c echo .... on the target (or local) host.