Fixed issue with jenkins master restart while the Aquarium node is still here

[sparshev]

Now Aquarium launcher knows that it can be started again on existing node, so will not try to create another Applicatio, will wait for the agent connection and continue pipeline execution if possible.

Related Issue

fixes: #25

Motivation and Context

Bugfix

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.