Fix/seeding

[johntmyers]

fixes #1656

What does this change

This removes re-seeding the Random() instance on every call to _select_factory() which gets called every time a faker method is used. This code was only reached when both conditions are true:

• A seed is set via Faker.seed()
• More than one locale is specified

What was wrong

Basically same as above, it is unnecessary to set the Random() instance's seed value every time a faker method is used. The Random() instance is seeded when making the call to Faker.seed() which is sufficient for making sure that the order of the locales selected is the same between subsequent instances of Faker

How this fixes it

Remove the seeding that isn't needed and modified a test that asserts:

• Generating values when a seed is used and multiple locales are used does not generate the same value over and over
• Calling Faker.seed() and using a Faker instance in an identical way will produce the same fake output each time

Fixes #...

[fcurella]

@johntmyers You can run make lint to format the code with our settings.

[johntmyers]

@fcurella everything is passing now

[fcurella]

Thank you!