Description of problem:
Metrics will stop work after stop then restart an app of embeded metrics

Version-Release number of selected component (if applicable):
rhc-0.87.6-1.el6_2.noarch
rhc-cartridge-metrics-0.1-0.9.3-1.el6_2.noarch

How reproducible:
Always

Notes:
Perl and ruby has only the same issue.

Steps to Reproduce:
1. create an app
#rhc-create-app -a perltest -l bzhao -p xxx -t perl-5.10

2. embed metrics-0.1 cartridge
#rhc-ctl-app -a perltest -l bzhao -p xxx -e add-metrics-0.1

3. stop this app using rhc-ctl-app
#rhc-ctl-app -a perltest -l bzhao -p xxx -c stop

3. restart this app using rhc-ctl-app and observe app and metrics's status
#rhc-ctl-app -a perltest -l bzhao -p xxx -c restart
  
Actual results:
Metrics will stop work after restart app

Expected results:
started app and metrics service without error successfully and get correct static metrics page without error

Additional info:
#rhc-ctl-app -a perltest -l bzhao -p xxx -c restart
#rhc-ctl-app -a perltest -l bzhao -p xxx -c status
RESULT:
Total Accesses: 0
Total kBytes: 0
Uptime: 10
ReqPerSec: 0
BytesPerSec: 0
BusyWorkers: 1
IdleWorkers: 0
Scoreboard: W....

# rhc-ctl-app -a perltest -p xxx -e status-metrics-0.1 -d
Contacting https://ec2-107-22-156-151.compute-1.amazonaws.com
Response from server:
DEBUG:

Exit Code: 0
api_c: placeholder
broker_c: namespacerhloginsshapp_uuiddebugaltercartridgecart_typeactionapp_nameapi
API version:    1.1.2

RESULT:
Metrics is either stopped or inaccessible