ovsdb: replication: Automatically switch read-only mode. #5327

Job	Run time
dpdk gcc	4s
linux rpm fedora	4m 34s
linux deb no dpdk	5m 57s
osx clang --disable-ssl	3m 28s
linux gcc --disable-ssl	2m 13s
linux clang --disable-ssl	2m 3s
linux gcc c99	2m 18s
linux clang c99	2m 3s
linux gcc test	6m 30s
linux clang test asan	10m 50s
linux clang test ubsan	7m 15s
linux gcc test --enable-shared	8m 44s
linux clang test --enable-shared	8m 45s
linux gcc check check-dpdk dpdk	13m 39s
linux clang check check-dpdk dpdk	13m 18s
linux gcc test -ljemalloc	6m 48s
linux clang test -ljemalloc	6m 52s
linux gcc --enable-afxdp	2m 10s
linux clang --enable-afxdp	2m 5s
linux gcc dpdk --enable-shared	3m 9s
linux clang dpdk --enable-shared	2m 43s
linux gcc dpdk-shared	2m 30s
linux clang dpdk-shared	2m 26s
linux gcc dpdk-shared --enable-shared	3m 0s
linux clang dpdk-shared --enable-shared	2m 44s
linux gcc m32 --disable-ssl	2m 12s
	2h 8m 20s

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