Gui 1134 set (via console.ini) boto retries to 2 across the board

https://eucalyptus.atlassian.net/browse/GUI-1134
@dkavanagh: Curious why the console.ini file defaults to 2 retries while the default here is set to 5.  There may be cases where an old console.ini file is used (i.e. the console.ini would be missing the connection.retries setting), setting the retries to the non-optimal value of 5.  Shouldn't we fallback to 2 in the settings.get() lookup?