[WIP] EBS driver fixes

[Kami]

Per #1634, it looks like EBS driver is broken and not working.

This is a quick and likely incomplete approach to try and fix that (it's not clear if that driver ever worked since some of the init code seems wrong and there are also no tests).

[codecov-commenter]

Codecov Report

Merging #1635 (134d1b8) into trunk (97a417d) will decrease coverage by 0.00%. The diff coverage is 47.36%.

@@            Coverage Diff             @@
##            trunk    #1635      +/-   ##
==========================================
- Coverage   83.17%   83.17%   -0.01%     
==========================================
  Files         398      398              
  Lines       86624    86704      +80     
  Branches     9204     9215      +11     
==========================================
+ Hits        72053    72116      +63     
- Misses      11442    11452      +10     
- Partials     3129     3136       +7     

Impacted Files	Coverage Δ
libcloud/backup/drivers/ebs.py	0.00% <0.00%> (ø)
libcloud/utils/xml.py	82.60% <60.00%> (-17.40%)	:arrow_down:
libcloud/common/aws.py	84.83% <100.00%> (ø)
libcloud/compute/drivers/openstack.py	85.17% <0.00%> (-0.39%)	:arrow_down:
libcloud/test/compute/test_openstack.py	94.53% <0.00%> (-0.02%)	:arrow_down:

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