explicitly use mail send setting in unit issue test (#15612)

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012361
add test not to send mail with no settng in creating issue (#15612)

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012362
add test to send one mail with both settngs in creating issue (#15612)

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012363
remove extra empty lines from test/unit/changeset_test.rb

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prevent i18n deprecated warning

i18n 0.6.4 on Rails 3.2.16 changes behavior.
https://github.com/svenfuchs/i18n/commit/3b6e56e06fd70f6e4507996b017238505e66608c

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012365
fix duplicate test name in IssuesControllerTest

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012367
remove duplicate test from UsersControllerTest

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