fix: release_6.1 yum repo

- no gpg check for ICS repo
- clobbering existing srp-rhel.repo
- moving from release_7 -> release_6.1 repo

Change-Id: I15749639dbb72a80d66d059893a6f82e087e3b03
fix: increasing yum timeout

Change-Id: I92d05f13b6da8521d5a0ef15829e30fbe561d581