Fix name conflict between two tests

* There is a SimpleTest in AlertTest.cpp, and an UnitTest in
balert/AlertTest.cpp. They ended up with the same grist as they are
built from the same jamfile. Rena

Fix name conflict between two tests

* There is a SimpleTest in AlertTest.cpp, and an UnitTest in
balert/AlertTest.cpp. They ended up with the same grist as they are
built from the same jamfile. Rename one of them to avoid this.

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