Do not set any TMP environment variables

This reverts daa833ea ( !3 ) and extend it to not set `$TMP` either.

De facto, setting only `$TMP` was never effective ( see also [#20120530-132221B](https://nexedi.erp5.net/bug_module/20120530-132221B) ) and as we saw in !3 (comment 67059) it causes more harm than good.

The conclusion so far is that environment variables related to temporary files should be handled by the parent process. The parent process is responsible for providing a directory short enough so that we can create unix sockets in `$TMPDIR`  and to clean up this directory afterwards.


In a pure buildout it could be:

```bash
tmpdir=$(mktemp -d)
trap 'rm -rf $tmpdir' SIGINT SIGTERM
TEMP=$tmpdir TMPDIR=$tmpdir TMP=$tmpdir buildout
rm -rf $tmpdir
```

/reviewed-on !8

slapos/recipe/cmmi/__init__.py

@@ -144,10 +144,6 @@ class Recipe(object):
         for key in self.environ:
             self.environ[key] = self.environ[key] % os.environ
 
-        # Always define TMPDIR, TEMP and TMP
-        for key in ('TMPDIR', 'TEMP', 'TMP'):
-            self.environ[key] = os.path.join(options['default-location'], 'tmp')
-
     def augmented_environment(self):
         """Returns a dictionary containing the current environment variables
         augmented with the part specific overrides.
@@ -155,6 +151,10 @@ class Recipe(object):
         The dictionary is an independent copy of ``os.environ`` and
         modifications will not be reflected in back in ``os.environ``.
         """
+        # Note that we don't set TMPDIR or TMP here as we use to do, because
+        # this path might be too deep and this will cause problem with some
+        # software (for example golang) who runs a test suite after build and
+        # use this TMPDIR to create unix sockets.
         env = os.environ.copy()
         env.update(self.environ)
         return env
@@ -342,9 +342,6 @@ class Recipe(object):
           shutil.rmtree(location)
         os.mkdir(location)
         os.chdir(compile_dir)
-        tmp_path = self.environ['TMP']
-        shutil.rmtree(tmp_path, True)
-        os.mkdir(tmp_path)
 
         if self.options['shared']:
           self._signature.save(self.options["shared"])
@@ -407,7 +404,7 @@ class Recipe(object):
                         and self.options['shared'] == ''
                         and os.path.exists(self.buildout_prefix)):
                     log.info('Getting installed file lists')
-                    parts.extend(self.get_installed_files(tmp_path))
+                    parts.extend(self.get_installed_files(compile_dir))
             except:
 
                 with open('slapos.recipe.build.env.sh', 'w') as env_script:
@@ -433,9 +430,6 @@ class Recipe(object):
                 raise
         finally:
             os.chdir(current_dir)
-            # If in shared mode and have error during installed, tmp_path was already deleted
-            if os.path.isdir(tmp_path):
-               shutil.rmtree(tmp_path)
 
         # Check promises
         self.check_promises(log)