[FIX] renamed function name db_exist -> exp_db_exist
[FIX] renamed function name db_exist -> exp_db_exist

Fixes problem when trying to restore a database.

See p_christ@hol.gr-20090829152346-7i1iiqs8skdddamq for the function rename

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