Move exclude_remote_names definition to PrePush base

This doesn't need to be in the base hook since it's used only in
`pre-push` hooks.

Author: sds

lib/overcommit/hook/base.rb

@@ -286,10 +286,6 @@ def exclude_branch_patterns
       @config['exclude_branch_patterns'] || []
     end
 
-    def exclude_remote_names
-      @config['exclude_remote_names'] || []
-    end
-
     def current_branch
       @current_branch ||= Overcommit::GitRepo.current_branch
     end

lib/overcommit/hook/pre_push/base.rb

@@ -21,6 +21,10 @@ def skip_for_remote_branch_deletion?
       ignore_branch_deletions? && @context.remote_branch_deletion?
     end
 
+    def exclude_remote_names
+      @config['exclude_remote_names'] || []
+    end
+
     def ignore_branch_deletions?
       @config['ignore_branch_deletions'] != false
     end