connect - add comments and add input verification

connect - add comments and add input verification
devices - add comments and add input verification
devtree - add comments and add input verification
dh - add comments, add input verification, add support for "-d"
disconnect - add comments and add input verification
drivers - add comments
drvcfg - add comment
drvdiag - add comments, add input verification, and fix language use
openinfo - add comments and add input verification
reconnect - add comment
unload - add input verification.

main library files: add comments, #define protection, and more output to the user.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11434 6f19259b-4bc3-4df7-8a09-765794883524