Increase resync speed to 60MB/s
Increase resync speed to 60MB/s

This is a forward-port of commit 2219 on the 1.2 branch.

Reviewed-by: ultrotter

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