Fixed exception during showing Node settings and set exclusive for mode

[sparshev]

Now node configuration displays the general node parameters as well as ApplicationUID for reference. Also it makes the node exclusive - there is no reason to keep it available for not specific jobs that needs this specific worker.

Related Issue

fixes: #19

Motivation and Context

Otherwise it shows exception there - not good.

How Has This Been Tested?

Manually

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.