Checkmk Werk 14416: Agent controller: Fix agent data transport for IPv4-only hosts

ID: 14416 Title: Agent controller: Fix agent data transport for IPv4-only hosts Component: agents Level: 1 Class: Bug fix Version: 2.2.0i1 The agent controller (<tt>cmk-agent-ctl</tt>) crashed on IPv4-only hosts when attempting to open a TCP socket in order to allow Checkmk to connect to the host and collect agent data. Note that on Linux hosts, this crash only occured if IPv6 was disabled at the kernel level. The corresponding error message read C+: ERROR [cmk_agent_ctl] Address family not supported by protocol (os error 97) C-: Note that this crash only affected the transport of agent data, not the host registration.