Add FusionPBX Command exec.php Command Execution

[bcoles]

Add FusionPBX Command exec.php Command Execution module.

    This module uses administrative functionality available in FusionPBX
    to gain a shell.

    The Command section of the application permits users with `exec_view`
    permissions, or superadmin permissions, to execute arbitrary system
    commands, or arbitrary PHP code, as the web server user.

    This module has been tested successfully on FusionPBX version
    4.4.1 on Ubuntu 19.04 (x64).

[wchen-r7]

Release Notes

The fusionpbx_exec_cmd_exec module has been added to the framework. It uses administrative functionality available in FusionPBX to gain a shell.