Use email instead of Account.Id to retrieve avatar image

On the client side references to the Account.Id should be removed for
information disclosure reasons. As a first step this change removes the
usage of Account.Id for retrieving avatar images. This is done because
follow up changes will display the avatar image in more place and it
should be avoided that the Account.Id appears in even more method
signatures than now.

Change-Id: I23b1d966e6cee1a2170856a73899440faad89f29
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
3 files changed