tests: rename t_mke2fs_errors and t_mke2fs_offset

The 't' prefix is for tune2fs tests.  The 'm' prefix is for mke2fs
tests.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/tests/t_mke2fs_errors/expect b/tests/m_error_behavior/expect
similarity index 100%
rename from tests/t_mke2fs_errors/expect
rename to tests/m_error_behavior/expect

diff --git a/tests/t_mke2fs_errors/script b/tests/m_error_behavior/script
similarity index 100%
rename from tests/t_mke2fs_errors/script
rename to tests/m_error_behavior/script

diff --git a/tests/t_mke2fs_offset/script b/tests/m_offset/script
similarity index 100%
rename from tests/t_mke2fs_offset/script
rename to tests/m_offset/script