Migrate fuzzer frontends to submodule

* Move frontends to deepstate.frontend
* Add dynamic loading in __init__.py for future frontends
* Refactor setup.py.in

bin/deepstate/frontend/__init__.py

@@ -0,0 +1,21 @@
+import sys
+import pkgutil
+import importlib
+
+from .frontend import DeepStateFrontend
+
+def import_fuzzers(pkg_name):
+  """
+  dynamically load fuzzer frontends using importlib
+
+  TODO(alan): find way to alias modnames so we can check
+  them before importing (ie. fuzzer submods need to start with `front_*`)
+  """
+  package = sys.modules[pkg_name]
+  return [
+    importlib.import_module(pkg_name + '.' + submod)
+    for _, submod, _ in pkgutil.walk_packages(package.__path__)
+    #if submod != "frontend"
+  ]
+
+__all__ = import_fuzzers(__name__)

bin/deepstate/frontend/frontend.py

@@ -119,7 +119,6 @@ class DeepStateFrontend(object):
     if cli_other is not None:
       self.cmd += cli_other
 
-
   def execute_fuzzer(self):
     """
     takes constructed cli command and executes fuzzer with subprocess.call

bin/setup.py.in

@@ -23,7 +23,7 @@ setuptools.setup(
     name="deepstate",
     version="0.1",
     package_dir={"": "${CMAKE_SOURCE_DIR}/bin"},
-    packages=['deepstate'],
+    packages=['deepstate', 'deepstate.frontend'],
     description="DeepState augments C/C++ Test-Driven Development with Symbolic Execution",
     url="https://github.com/trailofbits/deepstate",
     author="Peter Goodman",
@@ -37,7 +37,8 @@ setuptools.setup(
             'deepstate-angr = deepstate.main_angr:main',
             'deepstate-manticore = deepstate.main_manticore:main',
             'deepstate-reduce = deepstate.reducer:main',
-            'deepstate-eclipser = deepstate.eclipser:main',
+            'deepstate-afl = deepstate.frontend.afl:main',
-            'deepstate-angora = deepstate.angora:main'
+            'deepstate-eclipser = deepstate.frontend.eclipser:main',
+            'deepstate-angora = deepstate.frontend.angora:main'
         ]
     })