Remove rest plugin.

python/edu/build/plugin-list.txt

@@ -4,6 +4,4 @@ remote-servers-git
 github
 IntelliLang
 IntelliLang-python
-rest
-python-rest
 learn-python

python/edu/build/pycharm_edu_build.gant

@@ -205,8 +205,6 @@ public layoutEducational(String classesPath, Set usedJars) {
 
 private layoutPlugins(layouts) {
   dir("plugins") {
-    layouts.layoutPlugin("rest")
-    layouts.layoutPlugin("python-rest")
     layouts.layoutPlugin("learn-python")
   }