Description of problem:
Given a scalable app with DB cartrdge(mysql/mongo/postgresql), move any of the DB gear will be failed.

Version-Release number of selected component (if applicable):
devenv_3829


How reproducible:
always

Steps to Reproduce:
1. create multi-node env 
2. create one scalable app with mysql db
3. move mysql db gear to another node

Actual results:
oo-admin-move --gear_uuid 5243c8274977d10e26000011 -i ip-10-203-26-188
URL: http://zqpy27s-zqd.dev.rhcloud.com
Login: zzhao
App UUID: 5243c56b4977d1cab700005e
Gear UUID: 5243c8274977d1cab700009f
DEBUG: Source district uuid: 835207688557239203790848
DEBUG: Destination district uuid: 835207688557239203790848
DEBUG: Getting existing app 'zqpy27s' status before moving
DEBUG: Gear component 'python-2.7' was running
DEBUG: Stopping existing app cartridge 'mysql-5.1' before moving
DEBUG: Creating new account for gear '5243c8274977d10e26000011' on ip-10-203-26-188
DEBUG: Moving content for app 'zqpy27s', gear '5243c8274977d10e26000011' to ip-10-203-26-188
Identity added: /var/www/openshift/broker/config/keys/rsync_id_rsa (/var/www/openshift/broker/config/keys/rsync_id_rsa)
Agent pid 18103
unset SSH_AUTH_SOCK;
unset SSH_AGENT_PID;
echo Agent pid 18103 killed;
DEBUG: Moving system components for app 'zqpy27s', gear '5243c8274977d10e26000011' to ip-10-203-26-188
Identity added: /var/www/openshift/broker/config/keys/rsync_id_rsa (/var/www/openshift/broker/config/keys/rsync_id_rsa)
Agent pid 18244
unset SSH_AUTH_SOCK;
unset SSH_AGENT_PID;
echo Agent pid 18244 killed;
DEBUG: Moving failed.  Rolling back gear '5243c8274977d10e26000011' in 'zqpy27s' with delete on 'ip-10-203-26-188'
Node execution failure (invalid exit code from node)

Expected results:

can move db gear successfully.

Additional info:

development.log

013-09-26 01:43:46.858 [DEBUG] DEBUG: rpc_client.custom_request('cartridge_do', {:cartridge=>"openshift-origin-node", :action=>"frontend-backup", :args=>{"--with-container-uuid"=>"337602544118831148695552", "--with-container-name"=>"337602544118831148695552", "--with-namespace"=>"zqd", "--cart-name"=>"openshift-origin-node"}}, ip-10-114-25-51, {'identity' => ip-10-114-25-51}) (Request ID: ) (pid:20673)
2013-09-26 01:43:46.195 [DEBUG] DEBUG: [#<MCollective::RPC::Result:0x000000074ff0b8 @agent="openshift", @action="cartridge_do", @results={:sender=>"ip-10-114-25-51", :statuscode=>1, :statusmsg=>"cartridge_do_action failed -1. Output undefined method `[]' for nil:NilClass", :data=>{:time=>nil, :output=>"undefined method `[]' for nil:NilClass", :exitcode=>-1}}>] (Request ID: ) (pid:20673)
2013-09-26 01:43:46.196 [DEBUG] DEBUG: MCollective Response Time (execute_direct: frontend-backup): 0.111704858s  (Request ID: ) (pid:20673)
2013-09-26 01:43:46.196 [DEBUG] DEBUG: server results: undefined method `[]' for nil:NilClass (pid:20673)
2013-09-26 01:43:46.266 [DEBUG] DEBUG: Moving failed.  Rolling back gear '337602544118831148695552' in 'zqpy27s' with delete on 'ip-10-203-26-188' (pid:20673)
2013-09-26 01:43:46.268 [DEBUG] DEBUG: rpc_client.custom_request('cartridge_do', {:cartridge=>"openshift-origin-node", :action=>"app-destroy", :args=>{"--with-app-uuid"=>"5243c56b4977d1cab700005e", "--with-app-name"=>"zqpy27s", "--with-container-uuid"=>"337602544118831148695552", "--with-container-name"=>"337602544118831148695552", "--with-namespace"=>"zqd", "--with-uid"=>5854, "--with-request-id"=>nil, "--skip-hooks"=>true, "--cart-name"=>"openshift-origin-node"}}, ip-10-203-26-188, {'identity' => ip-10-203-26-188}) (Request ID: ) (pid:20673)
2013-09-26 01:43:47.389 [DEBUG] DEBUG: [#<MCollective::RPC::Result:0x000000075db0e0 @agent="openshift", @action="cartridge_do", @results={:sender=>"ip-10-203-26-188", :statuscode=>0, :statusmsg=>"OK", :data=>{:time=>nil, :output=>"NOTIFY_ENDPOINT_DELETE: 50.16.106.241 62301\n", :exitcode=>0}}>] (Request ID: ) (pid:20673)
2013-09-26 01:43:47.391 [DEBUG] DEBUG: MCollective Response Time (execute_direct: app-destroy): 1.123196316s  (Request ID: ) (pid:20673)
2013-09-26 01:43:47.411 [DEBUG] DEBUG: rpc_client.custom_request('cartridge_do', {:cartridge=>"postgresql-8.4", :action=>"start", :args=>{"--with-app-uuid"=>"5243c56b4977d1cab700005e", "--with-app-name"=>"zqpy27s", "--with-container-uuid"=>"337602544118831148695552", "--with-container-name"=>"337602544118831148695552", "--with-namespace"=>"zqd", "--with-uid"=>5854, "--with-request-id"=>nil, "--cart-name"=>"postgresql-8.4", "--component-name"=>"postgresql-8.4", "--with-software-version"=>"8.4", "--cartridge-vendor"=>"redhat"}}, ip-10-114-25-51, {'identity' => ip-10-114-25-51}) (Request ID: ) (pid:20673)
2013-09-26 01:44:10.308 [DEBUG] DEBUG: [#<MCollective::RPC::Result:0x0000000740f9f0 @agent="openshift", @action="cartridge_do", @results={:sender=>"ip-10-114-25-51", :statuscode=>0, :statusmsg=>"OK", :data=>{:time=>nil, :output=>"Starting Postgres cartridge\nserver starting\nPostgres started\n", :exitcode=>0}}>] (Request ID: ) (pid:20673)