[Bug 1376927] [NEW] [SRU] Configurable block device mapping timeout in compute

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[Impact]

User tried a  ceph storage node intentionally degraded, as a failure test case, on all the cases we hit
the following exception, 

2014-07-07 04:07:01.121 1573 TRACE nova.compute.manager [instance:
63386638-58ac-4a2d-ae3a-20ecc137c5ad] VolumeNotCreated: Volume 4b6611e2
-0e6b-44ec-8066-f8ac164d6a9c did not finish being created even after we
waited 197 seconds or 180 attempts.

2014-07-07 04:07:01.121 1573 TRACE nova.compute.manager [instance: 63386638-58ac-4a2d-ae3a-20ecc137c5ad] 
2014-07-07 04:07:01.750 1573 ERROR oslo.messaging.rpc.dispatcher [-] Exception during message handling: Block Device Mapping is Invalid.


This change adds two configuration options:
 
   a) `block_device_allocate_retries` which can be set in nova.conf
    by the user to configure the number of block device mapping retries.
    It defaults to 60 and replaces the max_tries argument in the above method.

    b) `block_device_allocate_retries_interval` which allows the user
    to specify the time interval between consecutive retries. It defaults to 3
    and replaces wait_between argument in the above method.


[Regression Potential] 

 *  This change introduces two new nova.conf directives, both with
default values that shouldn't broken previous deployments.


[Other Info]
 
Please refer upstream commit: 
https://git.openstack.org/cgit/openstack/nova/commit/?id=66721eb2c0f53fc4260b2f0aa9a3811da0f7ddbd

** Affects: nova (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: nova (Ubuntu Trusty)
     Importance: Undecided
         Status: New

** Affects: nova (Ubuntu Utopic)
     Importance: Undecided
         Status: New


** Tags: patch
-- 
[SRU] Configurable block device mapping timeout in compute 
https://bugs.launchpad.net/bugs/1376927
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