Modify environment to reflect powerpolicy manifest option

On enabling the powepolicy manifest option and setting the policy parameter to
any valid value (except "NONE") the application library providing contextual
information is loaded using LD_PRELOAD

See issue #10

nrm/containers.py

@@ -50,6 +50,8 @@ class ContainerManager(object):
         environ['AC_APP_NAME'] = manifest.name
         environ['AC_METADATA_URL'] = "localhost"
         logger.info("run: environ: %r", environ)
+        # TODO: Application library to load must be set during configuration
+        applicationpreloadlibrary = '.so'
 
         # create container
         container_name = request['uuid']
@@ -74,6 +76,12 @@ class ContainerManager(object):
                 if manifest.app.isolators.perfwrapper.enabled in ["1", "True"]:
                     argv.append('argo-perf-wrapper')
 
+        if hasattr(manifest.app.isolators, 'powerpolicy'):
+            if hasattr(manifest.app.isolators.powerpolicy, 'enabled'):
+                if manifest.app.isolators.powerpolicy.enabled in ["1", "True"]:
+                    if manifest.app.isolators.powerpolicy.policy != "NONE":
+                        environ['LD_PRELOAD'] = applicationpreloadlibrary
+
         argv.append(command)
         argv.extend(args)
         process = self.nodeos.execute(container_name, argv, environ)