ADI: add GetDiskAvgVel to regression test #1206

Job	Run time
build-drivers-release	4m 42s
build-postlib-release	10m 50s
build-all-debug-single	2m 54s
build-all-debug	6m 26s
build-test-uadriver-debug	1m 26s
rtest-module-drivers	4m 39s
rtest-modules-debug	11m 31s
build-interfaces-release	5m 24s
build-fastfarm-release	12m 51s
build-openfast-release	5m 53s
rtest-interfaces	3m 34s
rtest-OF-5MW_Land_AeroMap	1m 18s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	1m 59s
rtest-OF	15m 33s
rtest-OF-5MW_Land_BD_DLL_WTurb	2m 21s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	5m 7s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	2m 3s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	2m 16s
rtest-OF-linearization	4m 49s
rtest-OF-simulink	11m 39s
rtest-FF	2m 22s
	1h 59m 37s

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