connection contribution point (#880)

* init

* finished compile erros

* fixed all merge conflicts

* fix dialog problems

* formatting

* fix opening dialog on first open

* fix various problems with connectiondialog

* formatting

* fix tests

* added connection contrib

* formatting

* formatting and adding capabilities to shutdown

* fix connection buffering

* formatting

* fix tests

src/sql/parts/connection/common/connectionManagement.ts

@@ -239,14 +239,6 @@ export interface IConnectionManagementService {
 	 */
 	ensureDefaultLanguageFlavor(uri: string): void;
 
-	/**
-	 * Gets an array of all known providers.
-	 *
-	 * @returns {string[]} An array of provider names
-	 * @memberof IConnectionManagementService
-	 */
-	getProviderNames(): string[];
-
 	/**
 	 * Refresh the IntelliSense cache for the connection with the given URI
 	 */