LRA improvements

1. Improved error message to include [cluster/pod] instead of just
cluster if no cluster/pod provided to LRA script
2. Added sleep statements in order to improve readability while script
runs
3. Utilized wp-cli for WordPress core checks. Has improved the
processes accuracy, digital footprint, and speed
4. Added Eval function check for plugins and themes. This is a new
check that to see if dangerous eval functions are being used in PHP
files only. (Javascript not included)
Merge pull request #2 from wpe-onboarding/LRA-improvement

LRA improvements