rlib2: Improve test for _ParseInstanceReinstallRequest
rlib2: Improve test for _ParseInstanceReinstallRequest

Signed-off-by: Michael Hanselmann <68b67885ff74281219b4a4be33cc20fd45078d7c@google.com>
Reviewed-by: René Nussbaumer <bc755ac45a0e799d1d490cba76febc56d80cc5fc@google.com>

ganeti-github-testing/ganeti-test-1,dimara/ganeti,dimara/ganeti,yiannist/ganeti,leshchevds/ganeti,mbakke/ganeti,andir/ganeti,leshchevds/ganeti,grnet/snf-ganeti,apyrgio/snf-ganeti,mbakke/ganeti,apyrgio/ganeti,apyrgio/snf-ganeti,ganeti-github-testing/ganeti-test-1,bitemyapp/ganeti,yiannist/ganeti,grnet/snf-ganeti,onponomarev/ganeti,yiannist/ganeti,onponomarev/ganeti,mbakke/ganeti,leshchevds/ganeti,andir/ganeti,bitemyapp/ganeti,apyrgio/ganeti,ganeti/ganeti,ganeti/ganeti,andir/ganeti,ganeti/ganeti