Add SharedCredentials Provider to AWS

This will allows authentication with the AWS API using the
~/.aws/credentials file which is created by runnign 'aws configure' on
a node.

Signed-off-by: Sami Wagiaalla <swagiaal@redhat.com>

pkg/cloudprovider/providers/aws/aws.go

@@ -475,6 +475,7 @@ func init() {
 			[]credentials.Provider{
 				&credentials.EnvProvider{},
 				&credentials.EC2RoleProvider{},
+				&credentials.SharedCredentialsProvider{},
 			})
 		aws := &awsSDKProvider{creds: creds}
 		return newAWSCloud(config, aws)