Don't allow "error" in vcl_init{} and vcl_fini{}, they have no request to error.
Don't allow "error" in vcl_init{} and vcl_fini{}, they have no
request to error.

Fixes	#996

drwilco/varnish-cache-drwilco,ajasty-cavium/Varnish-Cache,franciscovg/Varnish-Cache,mrhmouse/Varnish-Cache,ajasty-cavium/Varnish-Cache,drwilco/varnish-cache-drwilco,alarky/varnish-cache-doc-ja,ajasty-cavium/Varnish-Cache,chrismoulton/Varnish-Cache,varnish/Varnish-Cache,feld/Varnish-Cache,1HLtd/Varnish-Cache,gquintard/Varnish-Cache,gquintard/Varnish-Cache,zhoualbeart/Varnish-Cache,chrismoulton/Varnish-Cache,feld/Varnish-Cache,1HLtd/Varnish-Cache,alarky/varnish-cache-doc-ja,chrismoulton/Varnish-Cache,gquintard/Varnish-Cache,franciscovg/Varnish-Cache,zhoualbeart/Varnish-Cache,gauthier-delacroix/Varnish-Cache,gauthier-delacroix/Varnish-Cache,chrismoulton/Varnish-Cache,varnish/Varnish-Cache,ajasty-cavium/Varnish-Cache,feld/Varnish-Cache,mrhmouse/Varnish-Cache,ajasty-cavium/Varnish-Cache,gauthier-delacroix/Varnish-Cache,alarky/varnish-cache-doc-ja,varnish/Varnish-Cache,drwilco/varnish-cache-drwilco,zhoualbeart/Varnish-Cache,feld/Varnish-Cache,chrismoulton/Varnish-Cache,zhoualbeart/Varnish-Cache,franciscovg/Varnish-Cache,1HLtd/Varnish-Cache,varnish/Varnish-Cache,varnish/Varnish-Cache,franciscovg/Varnish-Cache,ambernetas/varnish-cache,ambernetas/varnish-cache,alarky/varnish-cache-doc-ja,feld/Varnish-Cache,mrhmouse/Varnish-Cache,gquintard/Varnish-Cache,mrhmouse/Varnish-Cache,mrhmouse/Varnish-Cache,gauthier-delacroix/Varnish-Cache,gauthier-delacroix/Varnish-Cache,1HLtd/Varnish-Cache,ambernetas/varnish-cache,franciscovg/Varnish-Cache,zhoualbeart/Varnish-Cache,alarky/varnish-cache-doc-ja