Increase http_req_size, http_resp_size to 8192 bytes
Increase http_req_size, http_resp_size to 8192 bytes

Apache (and nginx) uses 8k, so use the same default size to avoid
people being surprised by more 413 responses than necessary.

Fixes: #1016

ssm/pkg-varnish,ssm/pkg-varnish,ssm/pkg-varnish,ssm/pkg-varnish,ssm/pkg-varnish