When building ISO, use package version from poudriere tree
When using remote repos, fetch pkgng from there as well
Revert "When using remote repos, fetch pkgng from there as well"

This reverts commit e1e01aa2cb622717b96801d5d60509b846316f5b.
Revert "When building ISO, use package version from poudriere tree"

This reverts commit bf106cc0aaa6db32914c4e3233bea368b2f38072.