Issue #2975835 by aaronbauman: Compatibility with drush 9

drush.services.yml

modules/salesforce_pull/composer.json

modules/salesforce_pull/drush.services.yml

modules/salesforce_pull/salesforce_pull.drush.inc

...s/salesforce_pull/src/Commands/SalesforcePullCommands.php

salesforce.install

src/Commands/QueryResult.php

src/Commands/QueryResultTableFormatter.php

src/Commands/SalesforceCommands.php

src/Commands/SalesforceCommandsBase.php

src/Rest/RestClient.php

src/Rest/RestClientInterface.php

src/SelectQuery.php

src/SelectQueryInterface.php

src/SelectQueryRaw.php

src/SelectQueryResult.php