VLR: send CHECK-IMEI to EIR/HLR

When check-imei-req is enabled in the VTY config, do not accept IMEIs
sent by the ME directly anymore. Send the IMEI to the EIR/HLR and wait
for its ACK or NACK.

OsmoHLR also accepts all IMEIs at this point, but this allows to
optionally store the IMEI in the HLR DB.

Depends: Ib240474b0c3c603ba840cf26babb38a44dfc9364 (osmo-hlr)
Related: OS#3733
Change-Id: Ife868ed71c36cdd02638072abebf61fc949080a7
10 files changed