tmf: Add source location to trace properties

tmf: Add source location to trace properties

The source location property is added and contains an URI indicating the
original source for a trace.

The source location URI depends on the method used to add the trace to a
Tracing project:

- Import wizard
- Batch Import wizard
- Open Trace File command
- Open Trace Directory command
- Drag and Drop from workspace
- Drag and Drop from external source

file:/<path>/<file>
file:/<path>/<folder>/

- Import Trace Package wizard

jar:file:/<path>/<archive>!/<path>/<file>
jar:file:/<path>/<archive>!/<path>/<folder>/

- Import action in LTTng Control view

sftp://<host>:<port>/<path>/<file>
sftp://<host>:<port>/<path>/<folder>/

Change-Id: I6bc4dc52bbbddd03d6f33ac4fc3d194cc1bded74
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/24268
Tested-by: Hudson CI
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>