Removing Amazon from the list OSs that are grouped with Red Hat 7.

Removing Amazon from the list OSs that are grouped with Red Hat 7.
Red Hat 7 has diverged from the Amazon system architecture and Amazon
uses a different versioning scheme. It's possible Amazon may re-align
with Red Hat 7 in later releases. Additional logic may be required
when that happens.

Description: Adding an exception for Amazon as the conditions for
RH7 were incorrectly catching Amazon because the version YYYY.MM
will always evaluate to true