ipam: Do not report error for static assigned IPs. #3212

Job	Run time
dpdk gcc	11s
osx clang --disable-ssl	2m 35s
linux rpm fedora	6m 39s
Prepare container	2m 9s
linux gcc --disable-ssl	2m 22s
linux clang --disable-ssl	2m 23s
linux gcc test -500	14m 5s
linux gcc test 501-1000	10m 19s
linux gcc test 1001-	5m 58s
linux clang test sanitizers -300	12m 12s
linux clang test sanitizers 301-600	14m 22s
linux clang test sanitizers 601-900	9m 40s
linux clang test sanitizers 901-1200	7m 30s
linux clang test sanitizers 1201-	7m 21s
linux gcc test -ljemalloc -500	14m 46s
linux gcc test -ljemalloc 501-1000	10m 40s
linux gcc test -ljemalloc 1001-	6m 5s
linux gcc system-test-dpdk dpdk -100	10m 55s
linux gcc system-test-dpdk dpdk 101-200	17m 29s
linux gcc system-test-dpdk dpdk 201-	19m 25s
linux gcc system-test-userspace -100	11m 6s
linux gcc system-test-userspace 101-200	16m 10s
linux gcc system-test-userspace 201-	17m 51s
linux gcc system-test -100	12m 56s
linux gcc system-test 101-200	18m 18s
linux gcc system-test 201-	24m 34s
linux clang system-test sanitizers -100	14m 52s
linux clang system-test sanitizers 101-200	20m 6s
linux clang system-test sanitizers 201-	26m 32s
linux x86 gcc --disable-ssl	2m 28s
	5h 41m 59s

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