coreos/manifest

Security Updates:

• curl 7.50.2 (CVE-2016-7141)

Bug Fixes:

• Don't deny logins due to user's shell (#1523)
• Fix off-by-one error in cgpt resize (#1527)
• Disable the systemd-resolved stub resolver (#1545)

Updates:

• Mayday 1.0.0
• Linux 4.7.3
• etcd 2.3.7
• rkt 1.14.0
• Ignition 0.11.0
• coreos-metadata 0.6.0
• git 2.7.3