Fixed error when checking for required parms that are part of a map
cloudmonkey: Simplify missing parameter check

This simplifies Carson Anderson's previous patch. We simply split by [ and take
the first element, if [ was not present we get the string/key itself.

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>
docs: Fix README and Makefile

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>