[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

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• caa2b840 - [servan/fpga] Add fpga ignored keys

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• 89aecdd8 - 1 commit from branch master
• a39f8295 - [servan/fpga] Add fpga ignored keys

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mentioned in commit 79c9a674

merged