Add script that reads in an osmo-msc log output and extracts the interesting
information for displaying a sequence chart of voice call log, in mscgen
format.
I want to visualize how the sequence of messages changes across patches. It is
error prone to do it manually, and re-doing the sequence chart for every patch
(and patch rework) would be prohibitively time consuming.
Change-Id: I2e4d8778f7b83dee558517a9b23450b817ee325d
Neels Hofmeyr