Test pygrub and pvgrub on the regular flights

Test pygrub and pvgrub on the regular flights

Since we now have the ability to test these drop one of each of
pygrub, pvgrub-32 and pvgrub-64 into the standard flights. Omitting
the {Guest}_diver runvar causes ts-debian-di-install to use the d-i
images in the location configured via TftpDiVersion, so they are
Version Controlled along with the d-i version used for the host.

This adds three new jobs:

+test-amd64-amd64-amd64-pvgrub                 all_hostflags               arch-amd64,arch-xen-amd64,suite-wheezy,purpose-test
+test-amd64-amd64-amd64-pvgrub                 arch                        amd64
+test-amd64-amd64-amd64-pvgrub                 buildjob                    build-amd64
+test-amd64-amd64-amd64-pvgrub                 debian_arch                 amd64
+test-amd64-amd64-amd64-pvgrub                 debian_bootloader           pvgrub
+test-amd64-amd64-amd64-pvgrub                 debian_method               netboot
+test-amd64-amd64-amd64-pvgrub                 debian_suite                wheezy
+test-amd64-amd64-amd64-pvgrub                 kernbuildjob                build-amd64-pvops
+test-amd64-amd64-amd64-pvgrub                 kernkind                    pvops
+test-amd64-amd64-amd64-pvgrub                 toolstack                   xl
+test-amd64-amd64-amd64-pvgrub                 xenbuildjob                 build-amd64

+test-amd64-amd64-i386-pvgrub                  all_hostflags               arch-amd64,arch-xen-amd64,suite-wheezy,purpose-test
+test-amd64-amd64-i386-pvgrub                  arch                        amd64
+test-amd64-amd64-i386-pvgrub                  buildjob                    build-amd64
+test-amd64-amd64-i386-pvgrub                  debian_arch                 i386
+test-amd64-amd64-i386-pvgrub                  debian_bootloader           pvgrub
+test-amd64-amd64-i386-pvgrub                  debian_method               netboot
+test-amd64-amd64-i386-pvgrub                  debian_suite                wheezy
+test-amd64-amd64-i386-pvgrub                  kernbuildjob                build-amd64-pvops
+test-amd64-amd64-i386-pvgrub                  kernkind                    pvops
+test-amd64-amd64-i386-pvgrub                  toolstack                   xl
+test-amd64-amd64-i386-pvgrub                  xenbuildjob                 build-amd64

+test-amd64-amd64-pygrub                       all_hostflags               arch-amd64,arch-xen-amd64,suite-wheezy,purpose-test
+test-amd64-amd64-pygrub                       arch                        amd64
+test-amd64-amd64-pygrub                       buildjob                    build-amd64
+test-amd64-amd64-pygrub                       debian_arch                 amd64
+test-amd64-amd64-pygrub                       debian_bootloader           pygrub
+test-amd64-amd64-pygrub                       debian_method               netboot
+test-amd64-amd64-pygrub                       debian_suite                wheezy
+test-amd64-amd64-pygrub                       kernbuildjob                build-amd64-pvops
+test-amd64-amd64-pygrub                       kernkind                    pvops
+test-amd64-amd64-pygrub                       toolstack                   xl
+test-amd64-amd64-pygrub                       xenbuildjob                 build-amd64

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>