Moved Eas.ACCOUNT_MANAGER_TYPE to Email.EXCHANGE_ACCOUNT_MANAGER_TYPE.
This constant is not related to the exchange protocol, and referred in
a lot of different places. Moving it out of the package will make it a lot
simpler when removing exchange dependency.
* Addresses #2226426
* Recognize the case in which there is no EmailProvider Account corresponding
to an AccountManager account (the case being addressed is that of the
EmailProvider database being deleted due to corruption
* In this case, delete the AccountManager account so that the two are in
sync
* Refactor and add unit test for account reconciliation
Change-Id: I356b8bfaa0846f85223cc15994b750df207a63ea
