test_driver: make testDomainGetTime read time from vm-private data
test_driver: make testDomainGetTime read time from vm-private data

Until now, testDomainGetTime would always return the same fixed values
everytime it was called. By using domain-private data we can make this
API return the values previously set with testDomainSetTime, or use the
same old fixed values in case testDomainSetTime hasn't been called at all.

Signed-off-by: Ilias Stamatis <3ef66acc2700f2eb6746a592b321628ebd41accf@gmail.com>
Reviewed-by: Erik Skultety <2c14d38fa47c8799f1b9c16280abe27f8edfec6e@redhat.com>

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