Description of problem:
Dhcpd doesn't close omapi connection properly if sender didn't send any data

Version-Release number of selected component (if applicable):
dhcp-server-4.3.5-9.fc26.x86_64

How reproducible:
100%

Steps to Reproduce:
1. configure omapi port and start dhcpd
2. ncat -z <host> <port>
3. lsof | grep dhcpd | grep TCP | wc -l 

Actual results:
number increases

Expected results:
unused sockets reaped

Additional info: