httpd: reduce request logging to debug_rpc level.
httpd: reduce request logging to debug_rpc level.

This brings back the behaviour of 2 commits ago.

splbio/openobject-server,ovnicraft/openerp-server,gisce/openobject-server,MarkusTeufelberger/openobject-server,vnc-biz/openerp-server,splbio/openobject-server,ovnicraft/openerp-server,gisce/openobject-server,MarkusTeufelberger/openobject-server,MarkusTeufelberger/openobject-server,splbio/openobject-server,vnc-biz/openerp-server,gisce/openobject-server