Final update to 10.1-RELEASE schedule to reflect the
releng/10.1 branch has been turned over to secteam@.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
Update the releng/index.html page to note releng/10.1
handoff to secteam@.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation