Remove hardcoded limitation of content size in Openstack Nova CreateServerOptions API

Openstack allow you to increase the bootstrap file size beyond 10K and the also increase the number of files injected via the configuration drive.

The Jcloud nova CreateServerOptions API is hardcoded to only allow default size of 10K and 5 files when openstack allows you to change these values via the project quotas.

Remove following validations from the CreateServerOptions should fix the issue

checkState(personality.size() < 5, "maximum number of files allowed is 5");

checkArgument(contents.length < 10 * 1024,
String.format("maximum size of the file is 10KB. Contents specified is %d bytes", contents.length));