golint for cliconfig
golint for cliconfig

 - fully capitalize HTTP in HTTPHeaders
 - comment for CONFIGFILE
 - camelcase and privatize oldConfigfile, defaultIndexserver
 - remove unused var errConfigFileMissing
 - comments for methods and functions throughout
 - external references to renamed variables changed

Signed-off-by: Morgan Bauer <9014cf436b229fe76f032246dafdb62784667fb6@us.ibm.com>

thaJeztah/distribution,thaJeztah/distribution