Ensure we use configured paths at import.

Previously if submodules were imported after the plugin/symbol __path__s had
been set, it would only use the __path__s from the constants module.

We now use the parent module's __path__s to ensure we get the right
sub__path__s.

This seems better/more flexible than changing the original constants
(since they'd no longer be constant) and allows people more chance to
override things.  It brings with it potential confusion as a local
plugin directory will need __init__ files with this magic to allow the
core modules to run (since they come first in the path list).

volatility/plugins/linux/__init__.py

@@ -8,12 +8,12 @@ are dependent upon, please DO NOT alter or remove this file unless you know the
 
 The framework is configured this way to allow plugin developers/users to override any plugin functionality whether
 existing or new.
+
+When overriding the plugins directory, you must include a file like this in any subdirectories that may be necessary.
 """
-
 import os
-
-from volatility.framework import constants
+import sys
 
 # This is necessary to ensure the core plugins are available, whilst still be overridable
-plugin_path_components = __name__.split('.')[2:]
-__path__ = [os.path.join(x, *plugin_path_components) for x in constants.PLUGINS_PATH]
+parent_module, module_name = ".".join(__name__.split(".")[:-1]), __name__.split(".")[-1]
+__path__ = [os.path.join(x, module_name) for x in sys.modules[parent_module].__path__]

volatility/plugins/mac/__init__.py

@@ -8,12 +8,12 @@ are dependent upon, please DO NOT alter or remove this file unless you know the
 
 The framework is configured this way to allow plugin developers/users to override any plugin functionality whether
 existing or new.
+
+When overriding the plugins directory, you must include a file like this in any subdirectories that may be necessary.
 """
-
 import os
-
-from volatility.framework import constants
+import sys
 
 # This is necessary to ensure the core plugins are available, whilst still be overridable
-plugin_path_components = __name__.split('.')[2:]
-__path__ = [os.path.join(x, *plugin_path_components) for x in constants.PLUGINS_PATH]
+parent_module, module_name = ".".join(__name__.split(".")[:-1]), __name__.split(".")[-1]
+__path__ = [os.path.join(x, module_name) for x in sys.modules[parent_module].__path__]

volatility/plugins/windows/__init__.py

@@ -8,12 +8,12 @@ are dependent upon, please DO NOT alter or remove this file unless you know the
 
 The framework is configured this way to allow plugin developers/users to override any plugin functionality whether
 existing or new.
+
+When overriding the plugins directory, you must include a file like this in any subdirectories that may be necessary.
 """
-
 import os
-
-from volatility.framework import constants
+import sys
 
 # This is necessary to ensure the core plugins are available, whilst still be overridable
-plugin_path_components = __name__.split('.')[2:]
-__path__ = [os.path.join(x, *plugin_path_components) for x in constants.PLUGINS_PATH]
+parent_module, module_name = ".".join(__name__.split(".")[:-1]), __name__.split(".")[-1]
+__path__ = [os.path.join(x, module_name) for x in sys.modules[parent_module].__path__]

volatility/plugins/windows/registry/__init__.py

@@ -8,12 +8,12 @@ are dependent upon, please DO NOT alter or remove this file unless you know the
 
 The framework is configured this way to allow plugin developers/users to override any plugin functionality whether
 existing or new.
+
+When overriding the plugins directory, you must include a file like this in any subdirectories that may be necessary.
 """
-
 import os
-
-from volatility.framework import constants
+import sys
 
 # This is necessary to ensure the core plugins are available, whilst still be overridable
-plugin_path_components = __name__.split('.')[2:]
-__path__ = [os.path.join(x, *plugin_path_components) for x in constants.PLUGINS_PATH]
+parent_module, module_name = ".".join(__name__.split(".")[:-1]), __name__.split(".")[-1]
+__path__ = [os.path.join(x, module_name) for x in sys.modules[parent_module].__path__]