[BugFix: Issue #297] Fix docker rate limit issues in Travis pipeline

[dikhan]

What problem does this Pull Request solve?

Please link to the issue number here (issue will be closed when PR is merged): Closes #297

Pasting here the error seen for the reference: toomanyrequests: You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit

• By logging into docker the rate increases are it's less likely that the pipeline will run into the rate limits

More info about rate limit here: https://www.docker.com/increase-rate-limits#:~:text=The%20rate%20limits%20of%20100,the%20six%20hour%20window%20elapses.

Type of change

What type of change does your code introduce to the provider? Please put an x (w/o heading/trailing white spaces) in the boxes that apply:

• [ ] New feature (change that adds new functionality)
• [x] Bug-fix (change that fixes current functionality)
• [ ] Tech debt (enhances the current functionality)
• [ ] New release (pumps the version)

Checklist

Please put an x (w/o heading/trailing white spaces) in the boxes that apply:

• [x] I have read and followed the CONTRIBUTING guidelines
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have made sure code compiles correctly and all tests are passing by running make test-all
• [x] I have added/updated necessary documentation (if appropriate)
• [x] I have added the following info to the title of the PR (pick the appropriate option for the type of change). This is important because the release notes will include this information.
  • [ ] Feature Request: PRs related to feature requests should have in the title [FeatureRequest: Issue #X] <PR Title>
  • [x] Bug Fixes: PRs related to bug fixes should have in the title [BugFix: Issue #X] <PR Title>
  • [ ] Tech Debt: PRs related to technical debt should have in the title [TechDebt: Issue #X] <PR Title>
  • [ ] New Release: PRs related to a new release should have in the title [NewRelease] vX.Y.Z

Checklist for Admins

• [x] Label is populated
• [x] PR is assigned to the corresponding project
• [x] PR has at least 1 reviewer and 1 assignee

[codecov[bot]]

Codecov Report

Merging #296 (5b7162b) into master (37c23f7) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #296   +/-   ##
=======================================
  Coverage   92.14%   92.14%           
=======================================
  Files          60       60           
  Lines        3069     3069           
=======================================
  Hits         2828     2828           
  Misses        163      163           
  Partials       78       78           

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