conf: Split out domain features formatting from virDomainDefFormatInternal
conf: Split out domain features formatting from virDomainDefFormatInternal

Pure code motion of code for formatting domain features to a function
called virDomainDefFormatFeatures. Best viewed with the '--patience'
option for git show.

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

jfehlig/libvirt,eskultety/libvirt,olafhering/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,libvirt/libvirt,jfehlig/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,crobinso/libvirt,nertpinx/libvirt,nertpinx/libvirt,jardasgit/libvirt,jardasgit/libvirt,eskultety/libvirt,andreabolognani/libvirt,crobinso/libvirt,eskultety/libvirt,eskultety/libvirt,jfehlig/libvirt,zippy2/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,jardasgit/libvirt,nertpinx/libvirt,olafhering/libvirt,libvirt/libvirt,fabianfreyer/libvirt,libvirt/libvirt,zippy2/libvirt,nertpinx/libvirt,andreabolognani/libvirt,olafhering/libvirt,andreabolognani/libvirt,olafhering/libvirt,fabianfreyer/libvirt,eskultety/libvirt,libvirt/libvirt,crobinso/libvirt,zippy2/libvirt,jardasgit/libvirt,andreabolognani/libvirt,zippy2/libvirt,crobinso/libvirt,nertpinx/libvirt