Security update for slirp4netns

This update for slirp4netns fixes the following issues:

- Update to 0.4.7 (bsc#1172380)
* libslirp: update to v4.3.1 (Fix CVE-2020-10756)
* Fix config_from_options() to correctly enable ipv6

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Fixed bugs
bnc#1172380
VUL-0: CVE-2020-10756: libslirp, slirp4netns, qemu: out-of-bounds read information disclosure in icmp6_send_echoreply()
Selected Binaries
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