[metastore] Query created by Browse Data action should have a limit and semi-colon

When a user creates a new table and clicks the Browse Data icon , the user is taken to the Hive Query Editor where a simple select statement displays (without a semi-colon).
1) If the user adds a query of his own and clicks submit, the query fails because the default query runs into his new query. If you add a semi-colon, all problems are solved.
2) Also, we don't know what table the user is going to create. We should put a limit on it to avoid a cluster meltdown.