debian: Use PIDFile with systemd. #6702

Job	Run time
osx clang --disable-ssl	1m 55s
dpdk gcc (ubuntu-24.04)	9s
libreswan (ubuntu-24.04)	5s
linux deb no dpdk	4m 59s
linux rpm fedora	4m 8s
build oss-fuzz fuzzers	2m 57s
clang-analyze-cache	12m 26s
linux gcc --disable-ssl	2m 37s
linux clang --disable-ssl	2m 45s
linux gcc c99	2m 30s
linux clang c99	2m 41s
linux gcc test	8m 41s
linux clang address,undefined test	16m 41s
linux gcc test --enable-shared	11m 34s
linux clang test --enable-shared	11m 51s
linux gcc check check-dpdk dpdk	20m 3s
linux clang check check-dpdk dpdk	19m 52s
linux gcc test -ljemalloc	9m 2s
linux clang test -ljemalloc	9m 2s
linux gcc --enable-afxdp	2m 36s
linux clang --enable-afxdp	2m 53s
linux gcc dpdk --enable-shared	3m 37s
linux clang dpdk --enable-shared	3m 54s
linux gcc dpdk-shared	3m 0s
linux clang dpdk-shared	2m 54s
linux gcc dpdk-shared --enable-shared	3m 57s
linux clang dpdk-shared --enable-shared	3m 56s
linux gcc m32 --disable-ssl	2m 40s
linux gcc check-ovsdb-cluster	6m 46s
linux gcc check-kernel -100	10m 41s
linux gcc check-kernel 100-	17m 3s
linux clang address,undefined check-kernel -100	12m 53s
linux clang address,undefined check-kernel 100-	19m 33s
linux gcc check-offloads -100	9m 58s
linux gcc check-offloads 100-	12m 26s
linux gcc dpdk check-system-userspace	12m 28s
linux clang address,undefined dpdk check-system-userspace	16m 15s
linux gcc dpdk check-system-tso	12m 8s
linux gcc dpdk check-afxdp	11m 58s
clang-analyze	10m 52s
	5h 26m 26s

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