Rename labs-hosts1-a-eqiad to labs-support1-a-eqiad

There are currently no compute nodes in row A, and this probably
won't change with the current nova-network model. Let's rename
this to labs-support which is what it currently seems to be used
for.

Change-Id: I2f4467d2a6b0152b7ec05c940811f05fd87c5019