Improve JMX MBeans and attributes filtering

The Decanter JMX collector is now able to filter (exclude) MBeans to collect.

It would be better to improve the way to include/exclude MBeans and attributes, including regex support.

I'm thinking about something like:

```
include=MBean_ObjectName1,MBean_ObjectName2:attribute,attribute,
exclude=MBean_ObjectName1,MBean_ObjectName2:attribute,attribute
```

The issue names the Decanter JMX collector but no files or tests. Start by locating the collector's current MBean exclusion filtering, then compare the proposed include/exclude syntax and regex support with existing behavior. Done means MBeans and attributes can be included or excluded according to the agreed syntax and regex rules.

Written by the indexing model from the issue text.