pkgfeed-ni-extra: remove openjdk-7
pkgfeed-ni-extra: remove openjdk-7

Including openjdk-7 in the feeds causes many dependencies from meta-java
to build, which inflates the total feed build time and makes it less
stable. In the absense of a specific requirement to include openjdk,
remove it from the -extra feed.

Signed-off-by: Alex Stewart <04cdb2793e4fb0120cc30d1c823099f3862701f4@ni.com>

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt