PDI-7426 - [PATCH] Subfolders for IMAP for Jobentry 'Get mails' and Transformation Step 'Email messages input'

junit tests added

new file:   engine/test-src/org/pentaho/di/job/entries/getpop/MailConnectionTest.java
PDI-7426 - [PATCH] Subfolders for IMAP for Jobentry 'Get mails' and transformation Step 'Email messages input'

patch applyed
Merge pull request #233 from prakapenka/PDI-7426

[PATCH] Subfolders for IMAP for Jobentry 'Get mails' and Transformation Step 'Email messages input'