Adds the ability to use Fully-Qualified Domain Name for PLC address

[patrickjmcd]

enip.connect and Controller.connect can accept FQDN provided it resolves to an IP Address

Description, Motivation, and Context

Allows access to PLC's with FQDN

How Has This Been Tested?

• npm run test:local passes
• functional test passes

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:

• 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.
• 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

Fix #11

[patrickjmcd]

Functional test worked for both IP address and FQDN

[coveralls]

Pull Request Test Coverage Report for Build 51

• 1 of 8 (12.5%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.3%) to 53.122%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/enip/index.js	1	8	12.5%

Totals
Change from base Build 50:	-0.3%
Covered Lines:	462
Relevant Lines:	837

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💛 - Coveralls

[cmseaton42]

merging this, ill add tests with a mass refactor soon