Remove SecurityManager references from logging package

[jmehrens]

Remove references to SecurityManager in the logging package. The access checking for the MailHandler can be performed by delegating to the global logger as is already done. Just need to drop the fallback check against the security manager.

The majority of changes will be against the unit tests. Some tests may not have an alternate implementation so this might reduce coverage.

[jmehrens]

Committed to 2.0.3 as:
d223d1f