When creating mailboxes (specifically 'drafts' or 'sent'), we need to ensure
that its default values for flags & server key are set correctly. In most
cases this is "okay" because the mailbox will be created on the server and
the values for these fields will be reset. However, in cases where system
mailboxes cannot be created on the sever (for example, the 'drafts' folder
on any POP3 account or an IMAP gmail account), these default values do not
get updated and we are unable to view the contents of these mailboxes.
bug 4356871
Change-Id: I9e6a394145f471b555c5827d5114bca243dbc37c
9d2dae6750