Norman Feske e4c636b0a0 init: clamp priority values to valid range
This patch ensures that priority values passed as session arguments
are within the valid range of priorities. Without the clamping, a child
could specify a priority of a lower priority band than the one assigned
to the subsystem. Thanks to Johannes Schlatow for reporting this issue.

Fixes #1279
2014-11-12 14:44:15 +01:00
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