Put three memory allocation hints into heritage:

Put three memory allocation hints into heritage:

mem_http_1_line (512)
	Maximum length of the reqeust/response line of a HTTP message
	There is no point in filling the entire buffer with junk if
	we get a preposterously long first line.
mem_http_header (4096)
	Maximum length of entire HTTP header.  If we overflow this
	we return 400.
mem_workspace (currently 0)
	In the future this will be the space we use for constructing
	headers to send and edits done from VCL.

git-svn-id: svn+ssh://projects.linpro.no/svn/varnish/trunk@392 d4fa192b-c00b-0410-8231-f00ffab90ce4