Two issues have occcured:
1) Zuul has decided some syntax is deprecated and generates an error.
The exlcusionary nature of the syntax is just not supported by RE2
which is the new requirement, so explicitly matching "^master$"
as opposed to "not stable branches".
2) Marking the snmp job as non-voting, the root issue appears to be ipxe
or the VMs, unknown as of yet.
Change-Id: I68aa95eb1ed80a0fde1c29d708ebd606393481aa
985c7fdf21