[IMP] Do not print non-string values of POST requests params in the log output (eg: multipart file upload)
[IMP] Do not print non-string values of POST requests params in the log output (eg: multipart file upload)

--HG--
extra : convert_revision : fme%40openerp.com-20110526203706-gex2rlv9h5quggc6

MarkusTeufelberger/openerp-web,vnc-biz/openerp-web,splbio/openerp-web,vnc-biz/openerp-web,vnc-biz/openerp-web,vnc-biz/openerp-web,MarkusTeufelberger/openerp-web,MarkusTeufelberger/openerp-web,gisce/openerp-web,splbio/openerp-web,gisce/openerp-web,gisce/openerp-web,splbio/openerp-web