Merge branch 'SubscriptionManager' into RequestResponseClient #1047

Job	Run time
clang-sanitizers (,thread)	10m 11s
clang-sanitizers (,address,undefined)	10m 20s
linux-compiler-compat (clang-3)	10m 0s
linux-compat (manylinux1-x64)	9m 33s
linux-compiler-compat (clang-6)	10m 7s
linux-shared-libs	2m 19s
linux-compat (manylinux1-x86)	9m 28s
linux-compiler-compat (clang-8)	10m 54s
linux-compat (manylinux2014-x64)	9m 51s
windows	11m 33s
linux-compat (manylinux2014-x86)	9m 46s
linux-compiler-compat (clang-9)	10m 40s
linux-compat (al2-x64)	10m 2s
windows-shared-libs	3m 13s
linux-compat (fedora-34-x64)	9m 45s
linux-compat (opensuse-leap)	10m 43s
linux-compiler-compat (clang-10)	10m 29s
windows-vc14 (x86)	9m 59s
linux-compiler-compat (clang-11)	10m 28s
windows-vc14 (x64)	15m 42s
linux-compat (rhel8-x64)	10m 5s
linux-compiler-compat (gcc-4.8)	9m 17s
linux-compiler-compat (gcc-5)	9m 42s
linux-compiler-compat (gcc-6)	9m 50s
linux-compiler-compat (gcc-7)	9m 42s
linux-compiler-compat (gcc-8)	10m 8s
downstream	10m 17s
osx	12m 4s
windows-app-verifier	13m 8s
	4h 49m 16s

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