Updated Dockerfile

[ntwrkguru]

What does this PR do?

Updated Dockerfile to:

• Use PyEZ 2.4.1 as the base image
• Install Ansible via PIP instead of apk
• Added no-cache for apk to reduce image size
• Removed junos-eznz from requirements.txt since we use PyEZ as the base image anyway
• Added /usr/bin/jsnapy as the ENTRYPOINT allowing easier use as an executable container
• Corrected the VOLUME declaration for /scripts

What issues does this PR fix or reference?

The VOLUME declaration was broken

New Behavior

Simplified use as an executable by added an ENTRYPOINT

Tests written?

No

[coveralls]

Pull Request Test Coverage Report for Build 362

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.419%

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Totals
Change from base Build 361:	0.0%
Covered Lines:	10270
Relevant Lines:	11234

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💛 - Coveralls

[ntwrkguru]

Please squash commits when merging...it's a little messy. :-/

[ntwrkguru]

Please review @vnitinv or @rahkumar651991

[vnitinv]

@ntwrkguru We will test and then do the needful.

[ntwrkguru]

@rahkumar651991 @vnitinv Ok to merge?