qemu: domain: Separate setup of TLS for VXHS disks from qemuDomainPrepareDiskSourceTLS
qemu: domain: Separate setup of TLS for VXHS disks from qemuDomainPrepareDiskSourceTLS

Split out the code into a separate function so that all steps for a
storage protocol are contained and the original function is easily
extendable.

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

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