supports copy object for same directory bucket (#455) #3673

Job	Run time
linux-compat (manylinux1-x64)	17m 7s
linux-compat (manylinux1-x86)	17m 26s
byo-crypto	3m 0s
linux-compat (manylinux2014-x64)	15m 59s
linux-compat (manylinux2014-x86)	16m 20s
linux-compiler-compat (clang-3)	17m 4s
linux-compat (al2-x64)	15m 41s
clang-sanitizers (,thread)	18m 6s
linux-compiler-compat (clang-6)	17m 56s
linux-shared-libs	16m 57s
linux-compiler-compat (clang-8)	18m 24s
clang-sanitizers (,address,undefined)	18m 0s
linux-compiler-compat (clang-9)	17m 19s
windows	15m 59s
linux-compiler-compat (clang-10)	17m 43s
linux-compiler-compat (clang-11)	17m 10s
downstream	17m 7s
linux-compiler-compat (gcc-4.8)	15m 47s
macos	18m 26s
linux-compiler-compat (gcc-5)	16m 21s
linux-compiler-compat (gcc-6)	16m 27s
macos-x64	15m 33s
linux-compiler-compat (gcc-7)	16m 47s
windows-app-verifier	32m 34s
linux-compiler-compat (gcc-8)	17m 24s
windows-shared-libs	16m 41s
windows-vc14 (x86)	16m 35s
windows-vc14 (x64)	15m 49s
linux-debug	17m 42s
	8h 13m 24s

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