[SPARK-14429][SQL] Improve LIKE pattern in "SHOW TABLES / FUNCTIONS LIKE <pattern>" DDL

LIKE <pattern> is commonly used in SHOW TABLES / FUNCTIONS etc DDL. In the pattern, user can use `|` or `*` as wildcards.

1. Currently, we used `replaceAll()` to replace `*` with `.*`, but the replacement was scattered in several places; I have created an utility method and use it in all the places;

2. Consistency with Hive: the pattern is case insensitive in Hive and white spaces will be trimmed, but current pattern matching does not do that. For example, suppose we have tables (t1, t2, t3), `SHOW TABLES LIKE ' T* ' ` will list all the t-tables. Please use Hive to verify it.

3. Combined with `|`, the result will be sorted. For pattern like `'  B*|a*  '`, it will list the result in a-b order.

I've made some changes to the utility method to make sure we will get the same result as Hive does.

A new method was created in StringUtil and test cases were added.

andrewor14

Author: bomeng <bmeng@us.ibm.com>

Closes #12206 from bomeng/SPARK-14429.