#2559 Support tenancy in OAuth providers

ext/oauth-client/CRM/OAuth/DAO/OAuthClient.php

ext/oauth-client/CRM/OAuth/DAO/OAuthContactToken.php

ext/oauth-client/CRM/OAuth/DAO/OAuthSysToken.php

ext/oauth-client/CRM/OAuth/Upgrader.php

ext/oauth-client/Civi/OAuth/CiviGenericProvider.php

ext/oauth-client/Civi/OAuth/OAuthLeagueFacade.php

ext/oauth-client/ang/oauthClientCreateHelp.aff.html

ext/oauth-client/ang/oauthClientCreator.aff.html

ext/oauth-client/ang/oauthClientEditor.aff.html

ext/oauth-client/oauth_client.civix.php

ext/oauth-client/providers/ms-exchange.dist.json

ext/oauth-client/sql/auto_install.sql

ext/oauth-client/sql/auto_uninstall.sql

...ient/tests/phpunit/Civi/OAuth/CiviGenericProviderTest.php

ext/oauth-client/xml/schema/CRM/OAuth/OAuthClient.xml