Make random extension range configurable

Previously if subscriber was automatically created it got assigned
random MSISDN number between 20000 and 49999. Make it configurable with
new vty command "subscriber-create-on-demand random" and expand vty
tests to check it.

Change-Id: I040a1d227b0c7a1601dc7c33eccb0007941408a6
Related: OS#1658
11 files changed
tree: 49bb94bc7ad856f277a72fd62c650a16d21e76ea
  1. contrib/
  2. debian/
  3. openbsc/
  4. .gitignore
  5. .gitreview