Merge pull request #36 from brianredbeard/tlsdate-fix

Fix for coreos/coretest#35 (coretest should be using ntp...)
Squashed commit of the following:

commit 4f2231ce33512d893d18b819ea63fc21c606b79f
Author: Brian 'Redbeard' Harrington <redbeard@dead-city.org>
Date:   Fri May 30 16:52:10 2014 -0700

    Fixing NTP to comply with the Go style guide

    Go style guide says that acronyms should be fully
    capitalized: TestNTPDate

commit fbf55a2797f69637bf9914bf5b34b07ecf9746ca
Author: Brian 'Redbeard' Harrington <redbeard@dead-city.org>
Date:   Fri May 30 15:52:44 2014 -0700

    Fix for coreos/coretest#35 (coretest should be using ntp...)

    Previously coretest was using tlsdate to check and make sure that
    it could perform outbound network connectivity to a tlsdate
    compatible endpoint.  This change switches to ntpdate using similar
    semantics.
Merge branch 'master' of ssh://github.com/coreos/coretest into tlsdate-fix