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A recent discussion around LSN-2016-0001 [1] included defining the sematics of an empty string for a VNC password. It was stated that "libxl interprets an empty password in the caller's configuration to mean that passwordless access should be permitted". The same applies for vncpasswd setting in xl.cfg. This patch extends to xl.cfg documentation to define the semantics of setting vncpasswd to an empty string. Signed-off-by: Jim Fehlig <jfehlig@suse.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com>