tmf: Bug 509613: Trace Manager loses Linux trace context data

tmf: Bug 509613: Trace Manager loses Linux trace context data

The trace context classes are updated to provide a builder that can be
extended and that is used to create a duplicate of a trace context with
some data that can be modified.

Change-Id: Icd3de5891cb37976795f485c837ac2e0e66f5501
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/87588
Reviewed-by: Hudson CI
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>