Removed deprecated methods from unit tests

This pull request removes deprecated set_table_name set_primary_key set_sequence_name methods
in unit tests.

Version 1.5 and later support Rails 4. These methods already deprecated. 
See http://guides.rubyonrails.org/3_2_release_notes.html "8.1 Deprecations"

This commit should not backport to release14branch which supports 3.2 and older version of Rails.