packaging: spec: require openjdk 1.7.0

Change-Id: I69aa839498385f99c2e4916be23472340fcca3ff
Bug-Url: https://bugzilla.redhat.com/1140746
Signed-off-by: Yedidyah Bar David <didi@redhat.com>
(cherry picked from commit 8a45c71b38050645e37a3a00f58b8adbb9db9b81)