[IMP] tools mail: encoding : add test for removing encoding attribute
[IMP] tools mail: encoding : add test for removing encoding attribute
MarkusTeufelberger/openobject-server,MarkusTeufelberger/openobject-server,splbio/openobject-server,gisce/openobject-server,splbio/openobject-server,gisce/openobject-server,MarkusTeufelberger/openobject-server,gisce/openobject-server,splbio/openobject-server