More information in requirements error message

[brody4hire]

Followup to PR #624:

• For some reason we determined in issue #623 & PR #624 that logging the value of JAVA_HOME was misleading. Part of the explanation may be that check_reqs.js overwrites the setting which I think is not the best solution. I would favor that we look for a better solution, then log the actual JAVA_HOME setting in case there was an issue with Java.
• Looking at the changes in PR #624, I think it would be ideal if the code would make it clear if there is an issue with both Java and Android SDK.