RFR 8187247: canonical import check compares classes by simple name

[Liam Miller-Cushon]

This change fixes a bug that causes javac to incorrectly accept
non-canonical imports if the actual and expected symbols have the same
simple name.

Bug: https://bugs.openjdk.java.net/browse/JDK-8187247
Webrev: http://cr.openjdk.java.net/~cushon/8187247/webrev.00/
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