exchange: Prevent policy provision NPE

If the EAS server fails to resolve provision, canProvision will return null,
which will make crash exchange account wizard trying to attach the policy
to VALIDATE_BUNDLE_POLICY_SET. Just return a NO_POLICY.

aosp change-id: https://android-review.googlesource.com/#/c/78695/
JIRA: CYAN-2356
Issue: https://jira.cyanogenmod.org/browse/CYAN-2356

Change-Id: I2ba3cab33fecf5a75e90e8254653556dd00a3738
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Fix mismatched function arguments in Contact query

addNameRow's last four arguments are
    accountName, displayName, firstName, lastName
while here it's called as if they were
    displayName, firstName, lastName, displayName
This was causing Exchange copied contacts to have the wrong format.

Also, addPhoneRow gets called with displayName instead of accountName as
the function signature says.

Change-Id: I19a918d599b8f395e0034d00a37d80c72e0d20f2