Avoid confusing cloudstack user data servers

[pyr]

Cloudstack does not cope well with trailing slashes. If other userdata servers can handle a lack of trailing slash, this would be useful and unbreak amongst others cloud-init for Ubuntu 13.10 at least.

I don't have means to test if EC2 handles trailing slashes well, maybe you guys can ?

[danielgtaylor]

I've just tested from a fresh EC2 instance:

$ curl http://169.254.169.254/latest/meta-data/
ami-id
ami-launch-index
ami-manifest-path
block-device-mapping/
hostname
instance-action
instance-id
instance-type
kernel-id
local-hostname
local-ipv4
mac
metrics/
network/
placement/
profile
public-hostname
public-ipv4
public-keys/
reservation-id
security-groups

$ curl http://169.254.169.254/latest/meta-data
< no output >

Unfortunately it looks like the trailing slash is a requirement for EC2, so I can't merge this in. I'm open to alternative suggestions for how to handle the other use cases like CloudStack.