Increase allowed missing memory to 512MB
Increase allowed missing memory to 512MB

Since Xen seems to “steal” some amounts of memory (depending on total
node memory), we increase the maximum allowed missing memory to 512MB,
based on gathered data from multiple machines.

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