perf script python: Move dsoname code to a new function

This patch creates a new function get_dsoname() and move the code which
gets the dsoname string to this function.

That's because in next patch, when we process LBR data, we will also
need get_dsoname() to return dsoname for branch from/to.

Signed-off-by: Jin Yao <[email protected]>
Reviewed-by: Andi Kleen <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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