The data written will be available for reading even before calling
Commit on the transaction. This allows constructs such as loops that
repeatedly look up and modify the same attribute to work, which fixes
the behavior of deleteAllApplicationSpecificPasswords() which
previously would only succeed in deleting one of them.

Fixes issue ai3/prod#233.

Update module go-ldap/ldap/v3 to v3.3.0

See merge request !31

Update module prometheus/client_golang to v1.10.0

See merge request !30

Update golang.org/x/crypto commit hash to 38f3c27

See merge request !28

Update golang.org/x/net commit hash to e18ecbb

See merge request !26

Disk usage

See merge request !27

We're now making all the asynchronous requests to aux-db from a single
backend wrapper (hence the rename as it's no longer just webapp data),
with a more generalized structure for resource-based lookups.

Use aux-db to retrieve cms_info data

See merge request !20

Internalize the webappdb.App type (part of CMSInfo).

Replace the dedicated 'webappdb' service with generic aux-db
lookups.

Update golang.org/x/net commit hash to 9060382

See merge request !25

Update golang.org/x/net commit hash to 5f55cee

See merge request !23

Update golang.org/x/sync commit hash to 036812b

See merge request !24

Update golang.org/x/crypto commit hash to 5ea612d

See merge request !22

Update golang.org/x/crypto commit hash to b8e89b7

See merge request !21

Refactor the errors to be compatible with Go > 1.13 error wrapping
idiom.

Update golang.org/x/net commit hash to 5f4716e

See merge request !19

This will make it easier in the future to replace the implementation
with one that is resource-aware (as input to lookup() is no longer
just a list of 'sites').

Publish per-op counters for all backends (ldap, cache).