Allow ZET to inherit externally managed event and cmd socket fds #1002
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This PR allows the ziti-edge-tunnel to be systemd socket activated. In the case of systemd socket activation, the IPC sockets for the ZET are managed by systemd via .socket unit files. When a client connects to one of these IPC sockets, systemd will dynamically start the ziti-edge-tunnel.service unit, and set file descriptors for the IPC sockets that are visible to the ziti-edge-tunnel process via libsystemd library functions. When such file descriptors are set, the ziti-edge-tunnel opens the existing file descriptors instead of creating it's own IPC sockets.
This allows clients to dynamically start the ziti-edge-tunnel process if they can connect to the sockets.
Under normal circumstances, there is no effect to the startup or operation of the tunneler.
Most of the changes are simply to allow for the libsystemd dynamic loading to occur earlier in the ziti-edge-tunnel.c file. This file contains the bulk of the relevant changes.