fix #1701: disqualify package name in type name resolution

[liufengyun]

Fix #1701 : disqualify package name in type name resolution

Review @odersky

[odersky]

I think here we should try to prevent the problem at the root. Can you try to change line 431 in Symbols.scala to the following:

  if (this.is(Module, butNot = Package)) this.owner.asClass.enter(this.moduleClass)

Then we won't have add more clauses to qualifies.

[liufengyun]

@odersky I tried and it works!

[odersky]

LGTM :-)