dovecot enchancement and bug fixes

* add mailbox to block_names
* fix for block_args in quotes
* fix for block's brackets upon write
* fixes broken tests for mailbox
* fixes indention
* test case for block_args with "
* fixes broken indention
Use Quote module in dovecot

* use Quote.dquote_spaces for quoting
include only *.repo files from yum.repos.d;