tests: move tests/misc/split-* into tests/split/...

* tests/split/suffix-length: Rename from tests/misc/split-a.
* tests/split/b-chunk: Rename from misc/split-bchunk.
* tests/split/fail: Rename from tests/misc/split-fail.
* tests/split/lines: Rename from tests/misc/split-l.
* tests/split/l-chunk: Rename from tests/misc/split-lchunk.
* tests/split/r-chunk: Rename from tests/misc/split-rchunk.
* tests/Makefile.am (TESTS): Reflect renaming.

tests/Makefile.am

@@ -249,12 +249,12 @@ TESTS =						\
   misc/sort-unique-segv				\
   misc/sort-version				\
   split/filter					\
-  misc/split-a					\
-  misc/split-bchunk				\
-  misc/split-fail				\
-  misc/split-l					\
-  misc/split-lchunk				\
-  misc/split-rchunk				\
+  split/suffix-length				\
+  split/b-chunk					\
+  split/fail					\
+  split/lines					\
+  split/l-chunk					\
+  split/r-chunk					\
   misc/stat-birthtime				\
   misc/stat-fmt					\
   misc/stat-hyphen				\