MailHandler LogManager support for mail entries #119
Description
During development of #110 I didn't include log manager support for reading mail entries. The MailHandler has always read mail entries as top level entries. After thinking more about this the MailHandler should allow configuration of mail entries via a local property as there as been a long standing issue where properties are cleared before invoking close. See: https://bugs.openjdk.org/browse/JDK-7092981
The way the MailHandler worked around this issue is to lazy store the values as they are read and by triggering those reads through verification. By adding the a mailEntries property this will allow the MailHandler to work with verification off. It also provides a unique namespace for this handler to override top level mail settings.