Revert to busybox nc for metricsproxy
nmap-ncat is causing issues in metricsproxy with globalnet:
Ncat: Version 7.92 ( https://nmap.org/ncat )
Ncat: Listening on :::8081
Ncat: Listening on 0.0.0.0:8081
Ncat: Connection from 10.129.0.19.
Ncat: Connection from 10.129.0.19:45064.
Ncat: assertion failed: count <= INT_MAX QUITTING.
It's not clear how to fix that, so this installs busybox and reverts
to busybox nc instead. To avoid having too many changes in nettest,
nmap-ncat is preserved for other uses.
Signed-off-by: Stephen Kitt <[email protected]>
