This doesn't change the behavior of varnishncsa that already ignores ESI
sub-requests unless the -E option is specified. This is however breaking
the default behavior of other VSL processing tools that gained the -E
option, aligning with varnishncsa's behavior. Except varnishhist, that
gained the E filter in its -P argument instead of the -E option.

This allows to also not collect ESI transactions in VXID mode to further
reduce churn and reduce the risk for overruns in varnishncsa.