Description of problem:

Version-Release number of selected component (if applicable):
5.6.0.9

How reproducible:
Always

Steps to Reproduce:
1. Settings -> Configuration -> Diagnostics
2. CFME Region -> Database
3. Run Database Garbage Collection Now  and submit

Actual results:
Evm.log:

[----] I, [2016-06-07T09:53:08.234570 #3036:1153988]  INFO -- : MIQ(MiqTask#update_status) Task: [1] [Active] [Ok] [Starting DB GC for Region: region_0]
[----] E, [2016-06-07T09:53:08.290558 #3036:1153988] ERROR -- : MIQ(MiqQueue#deliver) Message id: [450], Error: [undefined local variable or method `current_db_opts' for #<Class:0x0000000ce6fa30>]
[----] E, [2016-06-07T09:53:08.291265 #3036:1153988] ERROR -- : [NameError]: undefined local variable or method `current_db_opts' for #<Class:0x0000000ce6fa30>  Method:[rescue in deliver]
[----] E, [2016-06-07T09:53:08.291423 #3036:1153988] ERROR -- : /opt/rh/cfme-gemset/bundler/gems/rails-41f47090a7cd/activerecord/lib/active_record/dynamic_matchers.rb:21:in `method_missing'
/var/www/miq/vmdb/app/models/database_backup.rb:66:in `_gc'
/var/www/miq/vmdb/app/models/database_backup.rb:60:in `gc'
/var/www/miq/vmdb/app/models/miq_queue.rb:345:in `block in deliver'
/opt/rh/rh-ruby22/root/usr/share/ruby/timeout.rb:89:in `block in timeout'
/opt/rh/rh-ruby22/root/usr/share/ruby/timeout.rb:34:in `block in catch'
/opt/rh/rh-ruby22/root/usr/share/ruby/timeout.rb:34:in `catch'
/opt/rh/rh-ruby22/root/usr/share/ruby/timeout.rb:34:in `catch'
/opt/rh/rh-ruby22/root/usr/share/ruby/timeout.rb:104:in `timeout'
/var/www/miq/vmdb/app/models/miq_queue.rb:341:in `deliver'
/var/www/miq/vmdb/app/models/miq_queue_worker_base/runner.rb:106:in `deliver_queue_message'
/var/www/miq/vmdb/app/models/miq_queue_worker_base/runner.rb:134:in `deliver_message'
/var/www/miq/vmdb/app/models/miq_queue_worker_base/runner.rb:152:in `block in do_work'
/var/www/miq/vmdb/app/models/miq_queue_worker_base/runner.rb:146:in `loop'
/var/www/miq/vmdb/app/models/miq_queue_worker_base/runner.rb:146:in `do_work'
/var/www/miq/vmdb/app/models/miq_worker/runner.rb:334:in `block in do_work_loop'
/var/www/miq/vmdb/app/models/miq_worker/runner.rb:331:in `loop'
/var/www/miq/vmdb/app/models/miq_worker/runner.rb:331:in `do_work_loop'
/var/www/miq/vmdb/app/models/miq_worker/runner.rb:153:in `run'
/var/www/miq/vmdb/app/models/miq_worker/runner.rb:128:in `start'
/var/www/miq/vmdb/app/models/miq_worker/runner.rb:21:in `start_worker'
/var/www/miq/vmdb/app/models/miq_worker.rb:346:in `block in start'
/opt/rh/cfme-gemset/gems/nakayoshi_fork-0.0.3/lib/nakayoshi_fork.rb:24:in `fork'
/opt/rh/cfme-gemset/gems/nakayoshi_fork-0.0.3/lib/nakayoshi_fork.rb:24:in `fork'
/var/www/miq/vmdb/app/models/miq_worker.rb:344:in `start'
/var/www/miq/vmdb/app/models/miq_worker.rb:274:in `start_worker'
/var/www/miq/vmdb/app/models/miq_worker.rb:154:in `block in sync_workers'
/var/www/miq/vmdb/app/models/miq_worker.rb:154:in `times'
/var/www/miq/vmdb/app/models/miq_worker.rb:154:in `sync_workers'
/var/www/miq/vmdb/app/models/miq_server/worker_management/monitor.rb:52:in `block in sync_workers'
/var/www/miq/vmdb/app/models/miq_server/worker_management/monitor.rb:50:in `each'
/var/www/miq/vmdb/app/models/miq_server/worker_management/monitor.rb:50:in `sync_workers'
/var/www/miq/vmdb/app/models/miq_server.rb:173:in `start'
/var/www/miq/vmdb/app/models/miq_server.rb:264:in `start'
/var/www/miq/vmdb/lib/workers/evm_server.rb:65:in `start'
/var/www/miq/vmdb/lib/workers/evm_server.rb:92:in `start'
/var/www/miq/vmdb/lib/workers/bin/evm_server.rb:4:in `<main>'
[----] I, [2016-06-07T09:53:08.291947 #3036:1153988]  INFO -- : MIQ(MiqQueue#delivered) Message id: [450], State: [error], Delivered in [0.100869191] seconds
[----] I, [2016-06-07T09:53:08.294128 #3036:1153988]  INFO -- : MIQ(MiqQueue#m_callback) Message id: [450], Invoking Callback with args: ["Finished", "error", "undefined local variable or method `current_db_opts' for #<Class:0x0000000ce6fa30>", "nil"]
[----] I, [2016-06-07T09:53:08.294423 #3036:1153988]  INFO -- : MIQ(MiqTask#update_status) Task: [1] [Finished] [Error] [undefined local variable or method `current_db_opts' for #<Class:0x0000000ce6fa30>]

Expected results:
No error

Additional info: