File descriptor starvation

[icook]

Happens after a few thousand block solves in regtestnet.

tp: Accept error: accept tcp 127.0.0.1:3020: accept4: too many open files; retrying in 1s
http: Accept error: accept tcp 127.0.0.1:4020: accept4: too many open files; retrying in 1s
http: Accept error: accept tcp 127.0.0.1:3020: accept4: too many open files; retrying in 1s
http: Accept error: accept tcp 127.0.0.1:4020: accept4: too many open files; retrying in 1s
http: Accept error: accept tcp 127.0.0.1:3020: accept4: too many open files; retrying in 1s
http: Accept error: accept tcp 127.0.0.1:4020: accept4: too many open files; retrying in 1s
http: Accept error: accept tcp 127.0.0.1:3020: accept4: too many open files; retrying in 1s
INFO[01-08|19:22:21] Pusing blockchainInfo update             caller=coinbuddy.go:103
WARN[01-08|19:22:21] Error fetching getblockchaininfo         err="Post http://localhost:19021: dial tcp 127.0.0.1:19021: socket: too many open files" caller=coinbuddy.go:106
http: Accept error: accept tcp 127.0.0.1:4020: accept4: too many open files; retrying in 1s