libbsc: Add VTY command to re-send the SYSTEM INFORMATION to BTS

This is useful if you are updating some configuration parameters which
affect the content of the SYSTEM INFORMATION messages.  Currently, we
only send them at the time the RSL connection is established (i.e. when
the BTS is initialized), so if you change something, you need to bring
down and re-start the BTS.

Using the newly-introduced "bts <0-255> resend-system-information"
command, you can re-generate + re-send SYSTEM INFORMATION without
bringing the BTS down, i.e. without any radio carrier downtime.

Change-Id: I326df47de98f6d36c9a4d2d5475225d1e62bafb5
1 file changed