[build fix] karaf 4.0.4-snapshot no longer available. downgrading to the default 4.0.3
[build fix] karaf 4.0.4-snapshot no longer available. downgrading to the default 4.0.3

Signed-off-by: Davy Vanherbergen <7ef8e6030d27004247fae5be9602cc314999c25d@gmail.com>

AndreasDegenhart/openhab-distro,dvanherbergen/openhab-distro,AndreasDegenhart/openhab-distro,AndreasDegenhart/openhab-distro,dvanherbergen/openhab-distro