Added possibility to specify extra mounts in dobby config

[mateusz-hobgarski-red]

Description

Added possibility to specify extra mounts in dobby config.

Test Procedure

Add to dobby.json
"extraMounts": [
{
"source": "/tmp/communicator",
"destination": "/tmp/communicator",
"type": "bind",
"options": [ "bind", "nosuid", "nodev", "noexec" ]
}
],
Check in logs if it was parsed correctly and mount was added every container.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• [ x ] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (doesn't fit into the above categories - e.g. documentation updates)

Requires Bitbake Recipe changes?

• The base Bitbake recipe (meta-rdk-ext/recipes-containers/dobby/dobby.bb) must be modified to support the changes in this PR (beyond updating SRC_REV)

[goruklu]

@mateusz-hobgarski-red please resolve the conflict in DobbyManager.cpp