virdomainobjlist: Use virObjectRWLockable
virdomainobjlist: Use virObjectRWLockable

There is no reason why two threads trying to look up two domains
should mutually exclude each other. Utilize new
virObjectRWLockable that was just introduced.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>
Reviewed-by: Pavel Hrdina <d4772d05997b8abf035041e3b4f4996380ea7e7a@redhat.com>

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