python: consolidate tests

Currently the bulk of the tests in python-tests, some more in
python-sqlite3-tests, and others in their parent module (such as
python-ctypes).  This is pointless space usage if we're not planning on
running the tests, so consolidate all the tests into python-tests.

This is a backport of the same changes done by Ross Burton for python3

Changes since v1:
- Rebase

(From OE-Core rev: 0e94737e7124f689c3697d4227bfcd228cc04295)

Signed-off-by: Andrew Geissler <geissonator@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python/python2-manifest.json

@@ -1,4 +1,18 @@
 {
+    "tests": {
+        "summary": "Python test suite",
+        "rdepends": [
+            "core",
+            "modules"
+        ],
+        "files": [
+            "${libdir}/python2.7/*/test",
+            "${libdir}/python2.7/*/tests",
+            "${libdir}/python2.7/idlelib/idle_test/",
+            "${libdir}/python2.7/test"
+        ],
+        "cached": []
+    },
     "2to3": {
         "summary": "Python automated Python 2 to 3 code translator", 
         "rdepends": [
@@ -873,16 +887,6 @@
             "${libdir}/python2.7/lib-dynload/_sqlite3.so"
         ]
     }, 
-    "sqlite3-tests": {
-        "summary": "Python Sqlite3 database support tests", 
-        "rdepends": [
-            "core", 
-            "tests"
-        ], 
-        "files": [
-            "${libdir}/python2.7/sqlite3/test"
-        ]
-    }, 
     "stringold": {
         "summary": "Python string APIs [deprecated]", 
         "rdepends": [
@@ -925,15 +929,6 @@
             "${libdir}/python2.7/tty.py"
         ]
     }, 
-    "tests": {
-        "summary": "Python tests", 
-        "rdepends": [
-            "core"
-        ], 
-        "files": [
-            "${libdir}/python2.7/test"
-        ]
-    }, 
     "textutils": {
         "summary": "Python option parsin", 
         "rdepends": [