Remove extra GetNewUnit calls from AD15 #1191

Job	Run time
build-all-debug-single	3m 14s
build-drivers-release	5m 10s
build-postlib-release	9m 19s
build-all-debug	5m 4s
build-test-uadriver-debug	2m 2s
rtest-modules-debug	4m 34s
rtest-module-drivers	1m 23s
build-interfaces-release	3m 31s
build-fastfarm-release	11m 7s
build-openfast-release	3m 20s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	1m 30s
rtest-OF	6m 23s
rtest-OF-5MW_Land_BD_DLL_WTurb	2m 26s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	3m 8s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	4m 27s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	58s
rtest-OF-linearization	3m 45s
rtest-interfaces	3m 22s
rtest-FF	2m 13s
	1h 16m 56s

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