Update aws-sdk-ruby to output new mint log format

[nitisht]

aws-sdk-ruby logs need to be updated in the format below so that mint logs can be easily parsed.

{
    "name":"mc", // SDK Name
    "function":"testPresignGetObject", // Test function name
    "description": "test function description (optional)", //  Test function description
    "args":"", // key value map, varName:value. Only arguements that devs may be interested in
    "duration":"", // duration of the whole test
    "status":"", // can be PASS, FAIL, NA
    "alert":"failed to download pre-signed object(optional)", // error related, human readable message. Should be taken care of if present
    "error":"stack-trace/exception message(only in case of failure)" // actual low level exception/error thrown by the program
}

[nitisht]

@ebozduman the PR #117 is not merged yet, lets keep the issue open till the PR gets merged?

[ebozduman]

Sorry! My bad. I thought it is already merged. I'll re-open it.

[nitisht]

fixed by #117