pings in quick succession sometimes hang, leading to "network down" errors

[ollo22]

I see this happen randomly on my Samsung A3x/A5x's.

In https://github.com/decipher3114/Revancify/pull/24/commits/7df9e10418e6e4d4835cb73a66c16f164694c215 I've switched to a single check at the beginning of revancify (and main.sh, if somehow invoked independently, not from revancify)