Absence of .fog file will cause abrupt exit of mccloud vm list when first ec2 instance is encountered.

[jbirch-atlassian]

When more than one provider is configured, listing VMs will abruptly halt on the first ec2 provided VM if a ~/.fog file is not found, regardless of whether or not there are additional non-ec2 VMs to be listed.

For example, we currently see:

alias                         |provider            |ip-address
--------------------------------------------------------------------------------
alias1                        |provider            |          
Missing Credentials
Create the file /home/username/.fog with the following content:                                                                                                                                                        
=====================  snippet begin =====================                                                                                                                                                           
---                                                                                                                                                                                                                  
:xxxxxxxxx:                                                                                                                                                                                                          
  :aws_access_key_id: <your aws_access_key_id>                                                                                                                                                                       
  :aws_secret_access_key: <your aws_secret_access_key>                                                                                                                                                               

=====================  snippet end   =====================

Note the absence of "alias3". With a ~/.fog file, we might expect to see:

alias                         |provider            |ip-address
--------------------------------------------------------------------------------
alias1                        |providerA           |          
alias2                        |aws-us-east         |
alias3                        |providerA           |