bdev: Do not call Assemble() on children
bdev: Do not call Assemble() on children

The caller of dev.Assemble() (backend._RecursiveAssembleBD) is doing an
explicit recursion over all the children of the device, with better
error reporting. As such, we don't need this repeated assembly inside
the base BlockDev class.

Reviewed-by: ultrotter


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