[WIP] Add configuration option to unconnected send timeout

[gfcittolin]

Description, Motivation, and Context

Implements changes as discussed in #67 to allow custom-setting the value of timeout on unconnected send messages

How Has This Been Tested?

Tested with SoftLogix

Screenshots (if appropriate):

Types of changes

• [ ] 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 change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.
• [x] This is a work in progress, and I want some feedback (If yes, please mark it in the title -> e.g. [WIP] Some awesome PR title)

Related Issue

• #67
• netsmarttech/node-red-contrib-cip-ethernet-ip#10

[coveralls]

Pull Request Test Coverage Report for Build 148

• 1 of 2 (50.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.08%) to 51.102%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/controller/index.js	1	2	50.0%
<!--	Total:	1	2

Totals
Change from base Build 141:	0.08%
Covered Lines:	473
Relevant Lines:	884

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💛 - Coveralls