tests: move checkfs test to tests directory

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

diff --git a/checkfs/Makefile b/tests/checkfs/Makefile
similarity index 100%
rename from checkfs/Makefile
rename to tests/checkfs/Makefile

diff --git a/checkfs/README b/tests/checkfs/README
similarity index 100%
rename from checkfs/README
rename to tests/checkfs/README

diff --git a/checkfs/checkfs.c b/tests/checkfs/checkfs.c
similarity index 100%
rename from checkfs/checkfs.c
rename to tests/checkfs/checkfs.c

diff --git a/checkfs/comm.c b/tests/checkfs/comm.c
similarity index 100%
rename from checkfs/comm.c
rename to tests/checkfs/comm.c

diff --git a/checkfs/common.h b/tests/checkfs/common.h
similarity index 100%
rename from checkfs/common.h
rename to tests/checkfs/common.h

diff --git a/checkfs/makefiles.c b/tests/checkfs/makefiles.c
similarity index 100%
rename from checkfs/makefiles.c
rename to tests/checkfs/makefiles.c