Upgrade ZF components. Zend_Log

[okorshenko]

Description
Upgrade components from ZF1 to ZF2

As a long term goal, we would like to eliminate knowledge about 3rd party libraries from Magento code base. Magento code still can use 3rd party libraries, but they must be wrapped by Magento interfaces and classes (adapters) so that 3rd party libraries can be easily substituted by newest versions or alternative implementations.

Acceptance Criteria

1. Magento interfaces are defined and can be used instead of ZF1 classes in Magento code
2. Default implementations for new interfaces are defined and configured as the preferences for new interfaces
3. Client code of the ZF1 components is refactored to use Magento interfaces
4. Zend classes are used as private services in Magento adapters
5. Backward compatibility is preserved
6. ZF1 components are updated to ZF2

List of the components

#	Component Name (total usages count)	Module Name	Usages Count
1	Zend_Log (total: 7)	Framework\Test	3
		Framework\Shell.php	4

[tdgroot]

Even though I already created a PR, for the record:
I'd like to pickup this issue!

[okorshenko]

@tdgroot thank you! Could you please accept invite from Magento organization and I will assign this to you. Please, check your email

[tdgroot]

@okorshenko thanks for the invitation, I accepted it!

[magento-team]

Internal ticket to track issue progress: MAGETWO-67591