Make method static, based on IntelliJ 12 warning
Remove trailing whitespace
Move asgard version getter into service for reuse.

Also, use technique without deprecated classes.
ASGARD-1110 Add asgard user agent
Fix unit tests
Remove static from method

Based on code review discussion, it's better to utility
methods non-static in service classes for ease of overriding
in unit tests.
Merge pull request #282 from joesondow/ASGARD-1110-asgard-user-agent-to-Amazon

Asgard 1110 Add "asgard" user agent string to Amazon ClientConfiguration