Readable heat-container-agent log

The output of heat-container-agent has become unreadable. This patch
aims to address this in order to make debugging easier.

Additionally, this patch also adds missing dependencies in the most
recent fedora:rawhide (32) image.

Task: 36392
Story: 2006463

Change-Id: I54180b96357f6fa6d4044d818740ae70e036e435

dockerfiles/heat-container-agent/Dockerfile

@@ -16,9 +16,11 @@ RUN dnf -y --setopt=tsflags=nodocs --nogpgcheck install \
         findutils \
         gcc \
         kubernetes-client \
+        libffi-devel \
         openssh-clients \
         openssl \
         python-devel \
+        python-lxml \
         python-pip \
         python-psutil \
         redhat-rpm-config && \
@@ -55,6 +57,8 @@ RUN /tmp/write-os-apply-config-templates.sh
 
 COPY manifest.json service.template config.json.template tmpfiles.template /exports/
 
+RUN ln -s /usr/bin/python3 /usr/bin/python
+
 COPY launch /usr/bin/start-heat-container-agent
 
 # Execution

dockerfiles/heat-container-agent/scripts/55-heat-config

@@ -149,9 +149,6 @@ def invoke_hook(c, log):
     stdout, stderr = subproc.communicate(
         input=json.dumps(c).encode('utf-8', 'replace'))
 
-    log.info(stdout)
-    log.debug(stderr)
-
     if subproc.returncode:
         log.error("Error running %s. [%s]\n" % (
             hook_path, subproc.returncode))
@@ -168,6 +165,10 @@ def invoke_hook(c, log):
             'deploy_status_code': subproc.returncode,
         }
 
+    for i in signal_data.items():
+        log.info('%s\n%s' % i)
+    log.debug(stderr.decode('utf-8', 'replace'))
+
     signal_data_path = os.path.join(DEPLOYED_DIR, '%s.notify.json' % c['id'])
     # write out notify data for debugging
     with os.fdopen(os.open(