Use mime.ParseMediaType to obtain the main content type.

Update golang.org/x/crypto commit hash to 089bfa5

See merge request !31

Update module github.com/theckman/go-flock to v0.8.1

See merge request !36

Update module github.com/go-ldap/ldap/v3 to v3.4.1

See merge request !37

It was acting as an upper limit for the request lifetime, which isn't
necessary on internal services.

Update module github.com/coreos/go-systemd/v22 to v22.3.2

See merge request !30

Update module github.com/prometheus/client_golang to v1.11.0

See merge request !35

Update module github.com/cenkalti/backoff/v4 to v4.1.1

See merge request !34

Update module github.com/google/go-cmp to v0.5.6

See merge request !33

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

See merge request !26

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

See merge request !29

Update module coreos/go-systemd/v22 to v22.3.1

See merge request !28

Update module prometheus/client_golang to v1.10.0

See merge request !27

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

See merge request !21

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

See merge request !22

Update module go.opencensus.io to v0.23.0

See merge request !23

Update module coreos/go-systemd/v22 to v22.2.0

See merge request !24

Update module google/go-cmp to v0.5.5

See merge request !25

Update module go.opencensus.io to v0.22.6

See merge request !20

Update module cenkalti/backoff to v4

See merge request !18