Add clarifications to repair design and support restarts
Add clarifications to repair design and support restarts

Support restarting of failed repair events, by allowing unconditional
forgetting of a failed event.  Also, rename it to maintenance daemon
to emphasize that it does more than just coordinating repairs.

Signed-off-by: Andrew King <d0ce8d9e41ae9d87b35767c555bf850944fb1211@google.com>
Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>

onponomarev/ganeti,andir/ganeti,ganeti/ganeti,bitemyapp/ganeti,mbakke/ganeti,mbakke/ganeti,ganeti/ganeti,yiannist/ganeti,leshchevds/ganeti,bitemyapp/ganeti,andir/ganeti,leshchevds/ganeti,grnet/snf-ganeti,yiannist/ganeti,leshchevds/ganeti,onponomarev/ganeti,grnet/snf-ganeti,yiannist/ganeti,mbakke/ganeti,andir/ganeti,ganeti/ganeti