Adding parameter validation to build scripts

[PatrickLang]

What this PR does / why we need it:

If you run ./build/build-all.sh or ./build/build-all-containerized.sh, it will fail:

command-line-arguments
go build -v -o output/_/cni/azure-vnet-ipam.exe -ldflags "-X main.version=v1.0.12-rc3-8-g009ebee-dirty -s -w" cni/ipam/plugin/*.go
github.com/Azure/azure-container-networking/cni/ipam
command-line-arguments
cp cni/azure-.conflist output/_/cni/10-azure.conflist
cp: cannot stat 'cni/azure-.conflist': No such file or directory
Makefile:246: recipe for target 'cni-archive' failed
make: *** [cni-archive] Error 1
Makefile:169: recipe for target 'all-containerized' failed
make: *** [all-containerized] Error 2

This fixes it and will show proper usage instead.

[PatrickLang]

@jhowardmsft here's what I was stuck on trying to build CNI

[matmerr]

Sorry this PR got lost to the ages! We're not using this script in any CI or prod scenarios, so I think that's why it went unnoticed