OS-500/422 Update EA values

OS-422 did not include the EA change in OS-500 which resulted in OS-500
reappearing.

Change-Id: I6344a95940d820fa2268d5510a44984d84e56ee1
OS-549, unused exceptions removed, code refactored
Merge pull request #27 from roman-verchikov/OS-500/422

OS-500/422 Update EA values
OS-509, retry 3 times create IOS object, before fall with exception
Merge pull request #24 from Vegasq/OS-549

OS-549, unused exceptions removed
Merge pull request #22 from Vegasq/OS-509

OS-509, retry 3 times create IOS object, before fall with exception
OS-432 Update existing NIOS network on subnet create
Fixes after merge pep8 errors
Merge pull request #30 from Vegasq/pep8_fixes

Fixes after merge pep8 errors
Merge pull request #28 from Vegasq/OS-432_2

OS-432 Update existing NIOS network on subnet create
OS-295, get_subnet replaced with own implementation
OS-507 revert Arecord and PTRrecurd in exceptions cases
OS-553 remove namespaces during dhcp_agent disabling
Merge pull request #31 from Vegasq/OS-295_juno2

OS-295, get_subnet replaced with own implementation
Merge pull request #33 from Vegasq/OS-553_juno

OS-553 remove namespaces during dhcp_agent disabling
Merge pull request #32 from Vegasq/OS-507_juno

OS-507 revert Arecord and PTRrecurd in exceptions cases
OS-563, uppercase network_type during extrattr creation
Merge pull request #34 from Vegasq/OS-563

OS-563, uppercase network_type during extrattr creation
OS-438, OS-570, IPv6 support for Infoblox