Removed the unnecessary code that set Fuel::$env in bootstrap_phpunit.ph...

...p

Signed-off-by: mamor <mamor.dev@gmail.com>

--
PR for https://github.com/fuel/core/issues/1287

I have to confirm the two.

one:
Before and after remove the code, unit tests have been similar results.

	$ php oil test group=Core
	Tests Running...This may take a few moments.
	PHPUnit 3.7.10 by Sebastian Bergmann.
	
	Configuration read from /foo/fuel/core/phpunit.xml
	
	...............................................................  63 / 328 ( 19%)
	............................................................... 126 / 328 ( 38%)
	............................................................... 189 / 328 ( 57%)
	............................................................... 252 / 328 ( 76%)
	............................................................... 315 / 328 ( 96%)
	.............
	
	Time: 1 second, Memory: 19.25Mb
	
	OK (328 tests, 348 assertions)

two:
After delete development/db.php and create test/db.php, I have confirmed the following.

Create TestCase

	<?php
	
	/**
	 * @group App
	 */
	class Test_Env extends TestCase
	{
	 	public function test_env() {
			$output = Fuel::$env;
			$expected = Fuel::TEST;
			$this->assertEquals($expected, $output);
		}
	
	 	public function test_db_connection() {
			$output = DBUtil::table_exists('exists');
			$this->assertTrue($output);
	
			$output = DBUtil::table_exists('not exists');
			$this->assertFalse($output);
		}
	
	}


Run command

	$ php oil test group=App
	Tests Running...This may take a few moments.
	PHPUnit 3.7.10 by Sebastian Bergmann.
	
	Configuration read from /foo/fuel/core/phpunit.xml
	
	..
	
	Time: 0 seconds, Memory: 14.75Mb
	
	OK (2 tests, 3 assertions)