Fix flower deployment on k8s

[c-w]

The flower pod is currently crashing with the following error:

Traceback (most recent call last):
  File "/usr/local/bin/flower", line 10, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.6/site-packages/flower/__main__.py", line 11, in main
    flower.execute_from_commandline()
  File "/usr/local/lib/python3.6/site-packages/celery/bin/base.py", line 298, in execute_from_commandline
    return self.handle_argv(self.prog_name, argv[1:])
  File "/usr/local/lib/python3.6/site-packages/flower/command.py", line 56, in handle_argv
    return self.run_from_argv(prog_name, argv)
  File "/usr/local/lib/python3.6/site-packages/flower/command.py", line 33, in run_from_argv
    self.apply_env_options()
  File "/usr/local/lib/python3.6/site-packages/flower/command.py", line 71, in apply_env_options
    value = option.type(value)
ValueError: invalid literal for int() with base 10: 'tcp://10.0.75.166:8080'

This is because k8s auto-injects a variable of the form {deployment_name}_PORT which mistakenly gets read by flower: FLOWER_PORT=tcp://10.0.75.166:8080. Namespacing all the k8s objects with the release name should fix this issue.