fd-util: Expose helper to pack fds into 3,4,5,...

fd-util: Expose helper to pack fds into 3,4,5,...

This is useful for situations where an array of FDs is to be passed into
a child process (i.e. by passing it through safe_fork). This function
can be called in the child (before calling exec) to pack the FDs to all
be next to each-other starting from SD_LISTEN_FDS_START (i.e. 3)