Update github.com/prometheus/common module

[danilo-gemoli]

As per title, update the prometheus/common module:

go get github.com/prometheus/[email protected]

What follow is the sole breaking change I have hit.
The field:

expfmt.FmtProtoDelim

is no longer public and it has been replaced by this function:

expfmt.NewFormat(expfmt.TypeProtoDelim)

They both result in the same string:

fmtProtoDelim        Format = protoFmt + ` encoding=delimited`

so we should be safe.

Check prometheus/common#576 for more information.

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[danilo-gemoli]

/retest-required

[danilo-gemoli]

We are running out of resources:

There are no nodes that your pod can schedule to - check your requests, tolerations, and node selectors (0/46 nodes are available: 3 node(s) had untolerated taint {node-group: stable}, 43 Insufficient cpu. preemption: 0/46 nodes are available: 3 Preemption is not helpful for scheduling, 43 No preemption victims found for incoming pod..)

[danilo-gemoli]

/retest-required

[droslean]

/retest

[droslean]

/lgtm
/approve

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