bitbake: Revert "fetch2/gitsm: use configparser to parse .gitmodules"

This reverts commit a4f42e396e2942fde94b8b4944487c1c45f7a295.

Unfortunately configparser is a bit more strict and fails to parse e.g.:
e104dd7f27/.gitmodules

[submodule "components/bt/controller/lib_esp32"]
	path = components/bt/controller/lib_esp32
        url = ../../espressif/esp32-bt-lib.git

The url is using 8 spaces while path 1 tab causing:
Exception: configparser.NoOptionError: No option 'url' in section: 'submodule "components/bt/controller/lib_esp32"'

It was fixed in:
62ca8e2fb4 (diff-fe7afb5c9c916e521401d3fcfb4277d5071798c3baf83baf11d6071742823584)

but mcuboot is using a bit older esp-idf revision in:
https://github.com/ATmobica/mcuboot/blame/main/.gitmodules

and mcuboot is then used as submodule in:
https://github.com/project-chip/connectedhomeip/blob/master/.gitmodules

so it might take a while for the fix to be propagated everywhere.

Not sure how common these issues are, but configparser parses
"url = ../../espressif/esp32-bt-lib.git" as 2nd line of "path"
value (because it's indented differently) while git submodule
and old gitsm implementation parses it as separate path and
url keys.

(Bitbake rev: d9eb2650256292a524a0c0bb1c0562d87bedcbc4)

Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/gitsm.py

@@ -47,20 +47,18 @@ class GitSM(Git):
         subrevision = {}
 
         def parse_gitmodules(gitmodules):
-            """
-            Parse .gitmodules and return a dictionary of submodule paths to dictionaries with path and url members.
-            """
-            import configparser
-            cp = configparser.ConfigParser()
-            cp.read_string(gitmodules)
-
             modules = {}
-            for section in [s for s in cp.sections() if s.startswith("submodule ")]:
-                module = section.split('"')[1]
-                modules[module] = {
-                    'path': cp.get(section, 'path'),
-                    'url': cp.get(section, 'url')
-                }
+            module = ""
+            for line in gitmodules.splitlines():
+                if line.startswith('[submodule'):
+                    module = line.split('"')[1]
+                    modules[module] = {}
+                elif module and line.strip().startswith('path'):
+                    path = line.split('=')[1].strip()
+                    modules[module]['path'] = path
+                elif module and line.strip().startswith('url'):
+                    url = line.split('=')[1].strip()
+                    modules[module]['url'] = url
             return modules
 
         # Collect the defined submodules, and their attributes