ovsdb-server: Allow user-provided config files. #2450

Job	Run time
dpdk gcc	8s
linux deb no dpdk	4m 49s
linux rpm fedora	4m 30s
osx clang --disable-ssl	3m 12s
linux gcc --disable-ssl	2m 10s
linux clang --disable-ssl	2m 12s
linux gcc c99	2m 9s
linux clang c99	2m 16s
linux gcc test	6m 29s
linux clang test asan	10m 46s
linux clang test ubsan	7m 22s
linux gcc test --enable-shared	8m 49s
linux clang test --enable-shared	9m 30s
linux gcc check check-dpdk dpdk	13m 49s
linux clang check check-dpdk dpdk	14m 4s
linux gcc test -ljemalloc	6m 50s
linux clang test -ljemalloc	6m 50s
linux gcc --enable-afxdp	2m 11s
linux clang --enable-afxdp	2m 3s
linux gcc dpdk --enable-shared	3m 3s
linux clang dpdk --enable-shared	2m 44s
linux gcc dpdk-shared	2m 35s
linux clang dpdk-shared	2m 10s
linux gcc dpdk-shared --enable-shared	2m 57s
linux clang dpdk-shared --enable-shared	4m 6s
linux gcc m32 --disable-ssl	2m 18s
	2h 10m 2s

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