The format of the Xcode preferences has changed, so we need to account
for the new format when looking up the default development team.
The account identifier (previously an email address) was not used by
any consumers of the provisioningTeams() function, so it was left out.
Pick-to: 6.9 6.8 6.5
Change-Id: I81a400000615594336e14c95db86ffa71a5c5ff9
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
380a9fdc87