VM & cluster hostnames; add vm templates.

DOC/Cluster.txt:
	minor intro on vm management using util/adm vm.

kernel/kernel.s:
	run vmcheck to fetch the hostname using rpc, and copy it
	into a new global hostname field.

kernel/net/cloudnet.s:
	add node_hostname: send it over the cluster network, and show the
	hostnames on the web interface.

kernel/net/httpd.s:
	increase log level for printing which file is served.

kernel/shell.s:
	add 'hostname' command (read-only).

kernel/vmware/chan.s:
	reduce debug.

kernel/vmware/vmware.s:
	vmcheck: add 'h' subcommand for 'info-get guestinfo.hostname',
	which passes that value from the host's .vmx file.

util/adm:
	add help alias;
	add set alias for vmrun writeVariable (haven't been able to read the
	value in the guest yet).
	add getip alias for getGuestIP (not implemented in guest).

	vm add: on modifying the config file, also set guestinfo.hostname.

vm/vmware/qure-template/*:
	virtual machine template with an empty 500Mb hdd (128kb actual).