Setting MTU values for all OpenShift Container Platform interfaces

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Issue

MTU values are set to low on vovsbr and vlinuxbr, I am unable to change the values
Issues are seen with deployments, metrics and the integrated registry
Timeouts seen due to MTU mismatch

Environment

OpenShift Enterprise 3.1 and 3.2
OpenShift Container Platform 3.3 and later

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