Add doodHostWorkingDirectory option

[smikitky]

This adds a new doodHostWorkingDirectory option to pluginJobRunner.

When using CIRCUS with the DooD (docker-outside-of-docker) approach, the main CIRCUS container and a plug-in container will be created like this:

Host --------------------------------------> CIRCUS
       -v c:\circus-data:/var/circus/data

Host -----------------------------------------------> Plugin (eg MRA-CAD)
       -v c:\circus-data\cs-tmp\dd6b343:/circus/in
          ^^^^^^^^^^^^^^^^^^^^^

CIRCUS running in a container must ask the host to create the plug-in container, but it does not know the path of the parent host directory (i.e., "c:\circus-data\cs-tmp"). This option is used to set this path. The path must correspond to the workingDirectory option.

To use this, add something like the following in circus config file (the actual value will depend on how you mounted volumes while creating the main CIRCUS container):

pluginJobRunner: {
  options: {
    workingDirectory: '/var/circus/data/cs-tmp',
    doodHostWorkingDirectory: 'c:\\circus-data\\cs-tmp'
  }
}