As these are exported variables by convention they should be uppercase.
Travis/Spellcheck fails because they are not uppercase and it therefore
expects them to be defined or set before use.
Sometimes FreeDNS does not reurn the subdomain page but rather
returns a page regarding becoming a premium member. This usually
happens after a period of inactivity. Immediately trying again
returns the correct subdomain page. So, we will try twice to
load the page
Now the FREEDNS_USER and FREEDNS_PASSWORD need only be exported the first
time it is used and whenever the userid or password is changed. Subsequent
runs use the cookie cached in account.conf
