UnitTestFrameworkPkg: Use TianoCore mirror of subhook submodule #514

Job	Run time
Linux CLANGDWARF	19m 38s
Linux CLANGPDB	18m 35s
Linux GCC	17m 14s
macOS XCODE5	15m 7s
Windows VS2019	25m 22s
Test (Ovmf, Ia32,X64,3264, XCODE5, RELEASE,DEBUG,NOOPT)	7m 54s
Test (Ovmf, Ia32,X64,3264, VS2019, RELEASE,DEBUG,NOOPT)	7m 59s
Test (Ovmf, Ia32,X64,3264, CLANGPDB, RELEASE,DEBUG,NOOPT)	8m 13s
Test (Ovmf, Ia32,X64,3264, CLANGDWARF, RELEASE,DEBUG,NOOPT)	8m 3s
Test (Ovmf, Ia32,X64,3264, GCC, RELEASE,DEBUG,NOOPT)	8m 3s
	2h 16m 8s

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