ovsdb-server: Allow user-provided config files. #5336

Job	Run time
linux deb no dpdk	6m 12s
dpdk gcc	4s
linux rpm fedora	4m 30s
osx clang --disable-ssl	3m 57s
linux gcc --disable-ssl	2m 12s
linux clang --disable-ssl	2m 37s
linux gcc c99	2m 15s
linux clang c99	2m 3s
linux gcc test	6m 33s
linux clang test asan	10m 57s
linux clang test ubsan	7m 5s
linux gcc test --enable-shared	8m 44s
linux clang test --enable-shared	8m 29s
linux gcc check check-dpdk dpdk	13m 59s
linux clang check check-dpdk dpdk	14m 0s
linux gcc test -ljemalloc	6m 52s
linux clang test -ljemalloc	6m 42s
linux gcc --enable-afxdp	2m 8s
linux clang --enable-afxdp	2m 8s
linux gcc dpdk --enable-shared	3m 17s
linux clang dpdk --enable-shared	2m 43s
linux gcc dpdk-shared	2m 15s
linux clang dpdk-shared	2m 17s
linux gcc dpdk-shared --enable-shared	3m 7s
linux clang dpdk-shared --enable-shared	2m 40s
linux gcc m32 --disable-ssl	2m 12s
	2h 9m 58s

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