added require statement for exceptions
added require statement for exceptions

qpleple/cloudstack-php-client,myENA/cloudstack-php-client,dcarbone/cloudstack-php-client,jasonhancock/cloudstack-php-client,phansys/cloudstack-php-client,phansys/cloudstack-php-client,myENA/cloudstack-php-client,dcarbone/cloudstack-php-client,jasonhancock/cloudstack-php-client