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

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

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
@@ skipping 48 matching lines @@
         [
           "bitmap-64bitMD5", 
           16723580409414313678
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": 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", 
           4569468668668628191
         ]
       ], 
       "ignore-failure": false
     }, 
     "displacement_8888.png": {
@@ skipping 39 matching lines @@
           16285974094717334658
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }