system-traffic: Fix syntax errors in FTP and IPv6 curl calls. #2546

Job	Run time
dpdk gcc (ubuntu-24.04)	8s
linux rpm fedora	4m 20s
linux deb no dpdk	7m 12s
libreswan (ubuntu-24.04)	4s
osx clang --disable-ssl	2m 2s
clang-analyze	20m 57s
linux gcc --disable-ssl	2m 34s
linux clang --disable-ssl	2m 48s
linux gcc c99	2m 44s
linux clang c99	2m 42s
linux gcc test	10m 27s
linux clang address,undefined test	16m 40s
linux gcc test --enable-shared	11m 12s
linux clang test --enable-shared	10m 59s
linux gcc check check-dpdk dpdk	18m 33s
linux clang check check-dpdk dpdk	18m 4s
linux gcc test -ljemalloc	9m 5s
linux clang test -ljemalloc	8m 55s
linux gcc --enable-afxdp	2m 38s
linux clang --enable-afxdp	3m 26s
linux gcc dpdk --enable-shared	4m 8s
linux clang dpdk --enable-shared	3m 49s
linux gcc dpdk-shared	2m 59s
linux clang dpdk-shared	3m 22s
linux gcc dpdk-shared --enable-shared	3m 56s
linux clang dpdk-shared --enable-shared	3m 41s
linux gcc m32 --disable-ssl	2m 33s
linux gcc check-ovsdb-cluster	6m 54s
linux gcc check-kernel -100	11m 9s
linux gcc check-kernel 100-	17m 35s
linux clang address,undefined check-kernel -100	14m 52s
linux clang address,undefined check-kernel 100-	19m 3s
linux gcc check-offloads -100	10m 17s
linux gcc check-offloads 100-	11m 20s
linux gcc dpdk check-system-userspace	12m 34s
linux clang address,undefined dpdk check-system-userspace	15m 52s
linux gcc dpdk check-system-tso	12m 17s
linux gcc dpdk check-afxdp	11m 50s
	5h 23m 41s

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