Demonstration of CLI and BML message flows

[orenvor]

This PR serves as demo for the use of CLI commands and BML messages.

This PR includes:

• Add CLI command: OREN_PRINT which demonstrate CLI based flow. This cli print a given string to log.
• Add BML message: OREN_REVERSE_STR which demonstrate request-response based flow of BML massages.
  This ACTION_BML_OREN_REVERSE_STR_REQUEST contain a string that will be reversed and return to the user by ACTION_BML_OREN_REVERSE_STR_RESPONSE.

[kantera800]

camel case is not according to prplmesh coding style .
I know that you see a lot of similar cases in the code right now , but we try not to introduce any more code taht is not according to the coding style . also from time to time we all try to fix it a bit .

[kantera800]

In general the changes are ok there are some small coding style changes required and a few nitpicks.
But these changes doesn't complete the task they were meant to do ,
the definition of the task was to:

1. get parameter from cli
2. send CMDU from controller to agent
3. print parameter in agent logs.
   This PR never actually sends anything to the agent ,
   instead internal bml CMDU request parsed in son_master (controller) and then returned back to the awaiting bml process using the promise mechanism.