Support --dry-run in harep
Support --dry-run in harep

Add a --dry-run option to harep, so that users can verify
that the actions taken by harep are the ones they want.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Lisa Velden <f95ae155456787aef400a49db463a62bbef84ead@google.com>

yiannist/ganeti,andir/ganeti,andir/ganeti,ganeti/ganeti,ganeti/ganeti,mbakke/ganeti,onponomarev/ganeti,leshchevds/ganeti,ganeti/ganeti,leshchevds/ganeti,andir/ganeti,leshchevds/ganeti,yiannist/ganeti,onponomarev/ganeti,mbakke/ganeti,mbakke/ganeti,yiannist/ganeti