testutilsqemu: Mock virTPMSwtpmSetupCapsGet()
testutilsqemu: Mock virTPMSwtpmSetupCapsGet()

In a recent commit of v8.5.0-85-g430ab88ab1 I've made domaincaps
XML report supported TPM versions. This was done by calling
virTPMSwtpmSetupCapsGet(). But this function isn't mocked and
thus domaincapstest calls the real implementation, which tries to
execute swtpm_setup binary. This fails, because
virFindFileInPath() is mocked in such way that it returns NULL
for anything else than qemu-*.

Anyway, while the real binary is not executed after all, we
should mock the function which tries to execute it so that
predictable result is returned.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>
Reviewed-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>

zippy2/libvirt,crobinso/libvirt,zippy2/libvirt,jfehlig/libvirt,libvirt/libvirt,zippy2/libvirt,zippy2/libvirt,libvirt/libvirt,libvirt/libvirt,crobinso/libvirt,crobinso/libvirt,jfehlig/libvirt,olafhering/libvirt,libvirt/libvirt,olafhering/libvirt,olafhering/libvirt,crobinso/libvirt,jfehlig/libvirt,jfehlig/libvirt,olafhering/libvirt