Fix case sensitivity of system database name

Use case insensitive comparison when checking if we are on the
system database to decide which ping query to use.

Author: henriknyman

cypher-shell/src/integration-test/java/org/neo4j/shell/commands/CypherShellMultiDatabaseIntegrationTest.java

@@ -60,6 +60,14 @@ public void switchingToSystemDatabaseWorks() throws CommandException {
         assertOnSystemDB();
     }
 
+    @Test
+    public void switchingToSystemDatabaseIsNotCaseSensitive() throws CommandException {
+        useCommand.execute("SyStEm");
+
+        assertThat(linePrinter.output(), is(""));
+        assertOnSystemDB();
+    }
+
     @Test
     public void switchingToSystemDatabaseAndBackToNeo4jWorks() throws CommandException {
         useCommand.execute(SYSTEM_DB_NAME);

cypher-shell/src/main/java/org/neo4j/shell/state/BoltStateHandler.java

@@ -162,7 +162,7 @@ private void reconnect(boolean keepBookmark) {
         };
         session = driver.session(sessionArgs.andThen(sessionOptionalArgs));
 
-        String query = activeDatabaseNameAsSetByUser.equals(SYSTEM_DB_NAME) ? "SHOW DATABASES" : "RETURN 1";
+        String query = activeDatabaseNameAsSetByUser.compareToIgnoreCase(SYSTEM_DB_NAME) == 0 ? "SHOW DATABASES" : "RETURN 1";
 
         resetActualDbName(); // Set this to null first in case run throws an exception
         StatementResult run = session.run(query);