sysutils/rubygem-hiera: update to 3.0.1

• this is paving the way for a Puppet 4.x port
• preserve 1.3.4 as sysutils/rubygem-hiera1
• use sysutils/rubygem-hiera1 in dependent ports
• change maintainer to ruby@

Approved by: robak (maintainer)
Differential Revision: https://reviews.freebsd.org/D3359