oeqa/selftest/reproducibile: rename of reproducible directories

oeqa/selftest/reproducibile: rename of reproducible directories

We do see a few reproducible issues are depending on the path length of the build directory.
https://bugzilla.yoctoproject.org/show_bug.cgi?id=15554

The current implementation of reproducible tests having different names for directories but with same length.
The build directory names are changed to have different length.

Signed-off-by: Sundeep KOKKONDA <sundeep.kokkonda@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>