rebaseline_server: apply ignored-tests.txt within rebaseline_server, not just on the bots

gm/rebaseline_server/testdata/inputs/gm-actuals/Test-Mac10.7-MacMini4.1-GeForce320M-x86_64-Debug/actual-results.json

 {
    "actual-results" : {
-      "failed" : null,
+      "failed" : {
+         "blanket-ignored_565.png" : [ "bitmap-64bitMD5", 22222222 ],
+         "blanket-ignored_8888.png" : [ "bitmap-64bitMD5", 22222222 ]
+      },
       "failure-ignored" : {
          "displacement_565.png" : [ "bitmap-64bitMD5", 4569468668668628191 ],
          "displacement_8888.png" : [ "bitmap-64bitMD5", 11401048196735046263 ],
          "displacement_gpu.png" : [ "bitmap-64bitMD5", 5698561127291561694 ],
          "displacement_pdf-mac.png" : [ "bitmap-64bitMD5", 12901125495691049846 ],
          "displacement_pdf-poppler.png" : [ "bitmap-64bitMD5", 16285974094717334658 ]
       },
       "no-comparison" : {
          "bigblurs_565.png" : [ "bitmap-64bitMD5", 14704206703218007573 ],
          "bigblurs_8888.png" : [ "bitmap-64bitMD5", 17309852422285247848 ],
@@ skipping 33 matching lines @@
             [ "bitmap-64bitMD5", 8518347971308375604 ]
          ],
          "ignore-failure" : false
       },
       "3x3bitmaprect_pdf-poppler.png" : {
          "allowed-digests" : [
             [ "bitmap-64bitMD5", 16723580409414313678 ]
          ],
          "ignore-failure" : false
       },
+      "blanket-ignored_565.png" : {
+         "allowed-digests" : [
+            [ "bitmap-64bitMD5", 111111111 ]
+         ],
+         "ignore-failure" : false
+      },
+      "blanket-ignored_8888.png" : {
+         "allowed-digests" : [
+            [ "bitmap-64bitMD5", 111111111 ]
+         ],
+         "ignore-failure" : false
+      },
       "displacement_565.png" : {
          "allowed-digests" : [
             [ "bitmap-64bitMD5", 16249664097236120848 ]
          ],
          "ignore-failure" : true
       },
       "displacement_8888.png" : {
          "allowed-digests" : [
             [ "bitmap-64bitMD5", 12120271618448785903 ]
          ],
@@ skipping 12 matching lines @@
          "ignore-failure" : true
       },
       "displacement_pdf-poppler.png" : {
          "allowed-digests" : [
             [ "bitmap-64bitMD5", 4741823272437589681 ]
          ],
          "ignore-failure" : true
       }
    }
 }