Merge pull request xcat2#7355 from xcat2/master

Merge from master to 2.16 branch for 2.16.5 release. (1)

Merge pull request xcat2#7199 from xcat2/master

Merge from master to 2.16 branch for 2.16.4 release. (3)

Tag 21C release

Merge pull request xcat2#7066 from xcat2/master

Merge from master to 2.16 branch for 2.16.3 release. (1)

Fix xnba problem with legacy boot

Merge pull request xcat2#6987 from xcat2/master

Merge from master to 2.16 branch for 2.16.2 release. (3)

Lenovo amended xCAT 2.16.1

Merge pull request xcat2#6874 from xcat2/master

Merge from master to 2.16 branch for 2.16.1 release. (2)

Fix pxelinux.0 dependency

We don't actually use pxelinux.0 for the most part,
so only copy if it exists.

Tag for 20B release