move iu.opts to no-iu.opts, change to --disable-iu

osmo-msc and osmo-sgsn have moved to --enable-iu by default.

Depends: I1c937cb0dea001e501714cf71bfc91ec5c3cda9f (osmo-msc)
         I04b07ffead5d5394651d80711d2de06162eeed14 (osmo-sgsn)
Change-Id: I9a590b9cb9d9318c822e33e8432f3f8e5eb6779f
3 files changed