lttng.ust: Tweaks to BinaryCallsite

lttng.ust: Tweaks to BinaryCallsite

- Rename the aspect (and Event table column) to Binary Location.
- Remove the concept of function name, it is not part of the
  information available from the trace. Was not being used
  anyway.
- Print the offset differently depending on if the address is
  absolute or not:
  /usr/lib/mylib.so+0x123 for Position-Indpendant-Code (PIC) binaries
  /usr/myprog@0x401234 for non-PIC binaries

The differentiation PIC/PIE is not very robust at the moment
(we just check if the file name ends in ".so"), but it will be
improved due to a new field being added by UST soon.

Change-Id: Ib0014a77e14c6a88ae19f0c4b410d3675f7966d4
Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Reviewed-on: https://git.eclipse.org/r/70307
Reviewed-by: Hudson CI
Reviewed-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>