[release-3.10] Allow the 9k-10k port range for Prometheus

[openshift-cherrypick-robot]

This is an automated cherry-pick of #9072

/assign vrutkovs

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[vrutkovs]

Holding until 3.10.z release

/hold

[0xmichalis]

/test all

[mjudeikis]

/test all

[openshift-ci-robot]

@openshift-cherrypick-robot: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/openshift-jenkins/gcp-upgrade	09d056f	link	/test gcp-upgrade
ci/openshift-jenkins/gcp	09d056f	link	/test gcp

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[simonpasquier]

@vrutkovs it seems that the gcp job is always failing on:

TASK [openshift_master_certificates : Generate the loopback master client config] ***
Tuesday 31 July 2018  11:20:11 +0000 (0:00:02.157)       0:13:28.052 ********** 
changed: [prtest-3b74bcd-289-ig-m-3wt3 -> 35.231.234.186] => (item=prtest-3b74bcd-289-ig-m-q38v)
changed: [prtest-3b74bcd-289-ig-m-3wt3 -> 35.231.234.186] => (item=prtest-3b74bcd-289-ig-m-qcc8)
ERROR! |failed expects hostvars is a dict

You commented on #7596 (comment) that it shouldn't affect 3.10 though. Any clue of what is happening?

[vrutkovs]

@simonpasquier see openshift/release#1135