Extract log utils into pkg/log

Docker-DCO-1.1-Signed-off-by: Josiah Kiehl <josiah@capoferro.net> (github: capoferro)
Output info to stdout

Docker-DCO-1.1-Signed-off-by: Josiah Kiehl <josiah@capoferro.net> (github: capoferro)
Only print Caller details on error case priorities

Docker-DCO-1.1-Signed-off-by: Josiah Kiehl <josiah@capoferro.net> (github: capoferro)
Use package level const instead of syslog

Docker-DCO-1.1-Signed-off-by: Josiah Kiehl <josiah@capoferro.net> (github: capoferro)
Remove log.New from pkg/log as it's only used in test code.

Docker-DCO-1.1-Signed-off-by: Josiah Kiehl <josiah@capoferro.net> (github: capoferro)
Revert unnecessary import reordering due to rebasing after the dotcloud -> docker rename

Docker-DCO-1.1-Signed-off-by: Josiah Kiehl <josiah@capoferro.net> (github: capoferro)
gofmt

Docker-DCO-1.1-Signed-off-by: Josiah Kiehl <josiah@capoferro.net> (github: capoferro)