Use utils.ReadFile to read SSL certificate
Use utils.ReadFile to read SSL certificate

Reviewed-by: iustinp


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