Move VUT options from vapi_options.h to vut_options.h

Some options were defined in the incorrect file. Move them where they
should be.
Enable -N option in VUT
Add support for caseless string comparison and regular expression
evaluation.
Implement -V (version) for vut (varnishlog)
Add -h option to print usage and exit
Add a VSL_COPT_TAILSTOP cursor option to the VSM cursor

If this option is set, the cursor will return EOF when reaching the log tail.
Set VSL_COPT_TAILSTOP when -d is in effect