Add documentation to -h for report types.
Add documentation to -h for report types.

This would already be printed if you typed -t with an incorrect type,
but -h should show everything.

Change-Id: I55fa9853b50f0f5b16442b9566e54ad74dd88a18
Reviewed-on: http://review.northscale.com/2033
Reviewed-by: Sean Lynch <9c3328a4a1f4f8f5c18b2d5b9057163c49b93ff3@literati.org>
Tested-by: Sean Lynch <9c3328a4a1f4f8f5c18b2d5b9057163c49b93ff3@literati.org>

membase/ns_server,mschoch/ns_server,nimishzynga/ns_server,vzasade/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,membase/ns_server,membase/ns_server,daverigby/ns_server,ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,daverigby/ns_server,ceejatec/ns_server,vzasade/ns_server,pavel-blagodov/ns_server,pavel-blagodov/ns_server,ceejatec/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,pavel-blagodov/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,nimishzynga/ns_server,nimishzynga/ns_server,daverigby/ns_server,pavel-blagodov/ns_server,nimishzynga/ns_server,ceejatec/ns_server,mschoch/ns_server,vzasade/ns_server,vzasade/ns_server,mschoch/ns_server,ceejatec/ns_server,mschoch/ns_server,daverigby/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,membase/ns_server