utilities: upcall_monitor: Remove sleep in loop. #6771

Job	Run time
dpdk gcc (ubuntu-24.04)	5s
linux rpm fedora	4m 4s
linux deb no dpdk	5m 57s
libreswan (ubuntu-24.04)	8s
build oss-fuzz fuzzers	2m 59s
osx clang --disable-ssl	1m 57s
clang-analyze-cache	11m 18s
linux gcc --disable-ssl	3m 40s
linux clang --disable-ssl	2m 48s
linux gcc c99	2m 35s
linux clang c99	4m 9s
linux gcc test	8m 34s
linux clang address,undefined test	17m 10s
linux gcc test --enable-shared	11m 34s
linux clang test --enable-shared	11m 23s
linux gcc check check-dpdk dpdk	19m 43s
linux clang check check-dpdk dpdk	19m 40s
linux gcc test -ljemalloc	10m 15s
linux clang test -ljemalloc	8m 53s
linux gcc --enable-afxdp	2m 27s
linux clang --enable-afxdp	2m 52s
linux gcc dpdk --enable-shared	4m 56s
linux clang dpdk --enable-shared	3m 50s
linux gcc dpdk-shared	2m 55s
linux clang dpdk-shared	2m 54s
linux gcc dpdk-shared --enable-shared	3m 49s
linux clang dpdk-shared --enable-shared	4m 1s
linux gcc m32 --disable-ssl	2m 33s
linux gcc check-ovsdb-cluster	6m 48s
linux gcc check-kernel -100	10m 21s
linux gcc check-kernel 100-	16m 54s
linux clang address,undefined check-kernel -100	13m 3s
linux clang address,undefined check-kernel 100-	19m 51s
linux gcc check-offloads -100	9m 36s
linux gcc check-offloads 100-	12m 9s
linux gcc dpdk check-system-userspace	12m 50s
linux clang address,undefined dpdk check-system-userspace	16m 51s
linux gcc dpdk check-system-tso	12m 44s
linux gcc dpdk check-afxdp	12m 35s
clang-analyze	10m 37s
	5h 31m 28s

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