buildsys: run test before compile to avoid clobbering the openid build binaries

buildsys: run test before compile to avoid clobbering the openid build binaries

dh_auto_test also checks for the build flags used, including any
`--cfg`, so it rebuilds and overwrites our carefully assembled daemon
binaries with openid support as it is run after build and before
install.
So manually ensure the order of first test then build (argh, hackes
of hackes >.<)

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>