[IMP] config: Test that the config file is readable
[IMP] config: Test that the config file is readable

Fixes #3237

addition-it-solutions/project-all,inspyration/odoo,stephen144/odoo,cpyou/odoo,tvtsoft/odoo8,microcom/odoo,alhashash/odoo,odoousers2014/odoo,dfang/odoo,microcom/odoo,storm-computers/odoo,ygol/odoo,microcom/odoo,alhashash/odoo,OpusVL/odoo,sysadminmatmoz/OCB,dfang/odoo,OpusVL/odoo,storm-computers/odoo,hip-odoo/odoo,sysadminmatmoz/OCB,dfang/odoo,addition-it-solutions/project-all,cpyou/odoo,mkieszek/odoo,alhashash/odoo,bplancher/odoo,ygol/odoo,cdrooom/odoo,ubic135/odoo-design,alhashash/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,bplancher/odoo,cdrooom/odoo,deKupini/erp,Grirrane/odoo,Elico-Corp/odoo_OCB,cdrooom/odoo,bplancher/odoo,cpyou/odoo,hip-odoo/odoo,laslabs/odoo,deKupini/erp,tvtsoft/odoo8,sysadminmatmoz/OCB,cpyou/odoo,addition-it-solutions/project-all,optima-ict/odoo,bplancher/odoo,sysadminmatmoz/OCB,tvtsoft/odoo8,stephen144/odoo,addition-it-solutions/project-all,laslabs/odoo,laslabs/odoo,ygol/odoo,odoousers2014/odoo,ygol/odoo,Grirrane/odoo,ubic135/odoo-design,syci/OCB,addition-it-solutions/project-all,deKupini/erp,tvtsoft/odoo8,ubic135/odoo-design,deKupini/erp,hip-odoo/odoo,inspyration/odoo,dfang/odoo,tvtsoft/odoo8,stephen144/odoo,hip-odoo/odoo,sysadminmatmoz/OCB,inspyration/odoo,storm-computers/odoo,alhashash/odoo,bplancher/odoo,syci/OCB,tvtsoft/odoo8,OpusVL/odoo,mkieszek/odoo,cpyou/odoo,ygol/odoo,syci/OCB,mkieszek/odoo,syci/OCB,deKupini/erp,Elico-Corp/odoo_OCB,ubic135/odoo-design,ygol/odoo,microcom/odoo,addition-it-solutions/project-all,storm-computers/odoo,hip-odoo/odoo,storm-computers/odoo,odoousers2014/odoo,Elico-Corp/odoo_OCB,dfang/odoo,syci/OCB,Grirrane/odoo,stephen144/odoo,sysadminmatmoz/OCB,cdrooom/odoo,stephen144/odoo,syci/OCB,microcom/odoo,mkieszek/odoo,inspyration/odoo,ygol/odoo,optima-ict/odoo,Grirrane/odoo,alhashash/odoo,optima-ict/odoo,OpusVL/odoo,sysadminmatmoz/OCB,ubic135/odoo-design,Elico-Corp/odoo_OCB,mkieszek/odoo,odoousers2014/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,optima-ict/odoo,optima-ict/odoo,odoousers2014/odoo,bplancher/odoo,mkieszek/odoo,odoousers2014/odoo,Grirrane/odoo,Grirrane/odoo,stephen144/odoo,optima-ict/odoo,laslabs/odoo,hip-odoo/odoo,microcom/odoo,storm-computers/odoo,dfang/odoo