Rework evacDrbdSecondaryInner to take the imove
Rework evacDrbdSecondaryInner to take the imove

Instead of hard-coding the instance move operation, let's accept is as
a parameter from the caller. This is the single thing that makes this
DRBD-specific, so removing it will help for future
patches. Furthermore, this abstract the imove op type into a single
place instead of two (the inner function and the nodeEvacInstance).

Signed-off-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>
Reviewed-by: Guido Trotter <f62ca4d5358bdaeef0e50e57f9f7e231de63727e@google.com>

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