[servan/fpga] Add fpga ignored keys

rake valid:homogeneity SITE=grenoble CLUSTER=servan VERBOSE=1
Differences found between successive nodes, per cluster:

The change set is represented using the following syntax:
  [["+", "path.to.key1", value],          # new key
   ["-", "path.to.key2", value],          # missing key
   ["~", "path.to.key3", value1, value2]] # modified value

lib/refrepo/valid/homogeneity.rb

@@ -63,6 +63,7 @@ eos
 
   ignore_regex = [
     ['~', /storage_devices\..*\.by_id/],
+    ['~', /\.*fpga\.*/],
   ]
 
   (0..5).each { |eth|