bitbake: gitsm: The fetcher did not process some recursive submodules properly.

bitbake: gitsm: The fetcher did not process some recursive submodules properly.

Move the submodule processing outside of the if statement to avoid any
optimizations that may happen.

Update the test cases to include the additional case, and split the other
test cases into individual tests to make it easier to figure out what
the failure may be.

(Bitbake rev: 0ec98c01ae50f95c9c74acf53013ac59e0e72b08)

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>