bsc: properly test assignment counters

Verify the BTS level assignment:attempted_speech / _sign as well as
assignment:completed_speech / _sign counters, in four selected
assignment tests (fr, hr, amr_f, amr_h).

Shows a bug where we counted a speech assignment as
assignment:completed_sign.

Related: SYS#4878
Depends: Ie9fcd1e86f27ecb2f11e2e8813faac365cb470b8 (osmo-bsc)
Change-Id: Icb1386ec2ccd70eb3c026301b9b08ad7177278f7
1 file changed