changed module names to lower-case and group to org.opencadc to conform to maven repo naming standards

set max proxy cert lifetime to 30 days; changed get proxy cert to truncate requested lifetime to configured max for trusted principals

moved tests from internaql code; made CertificateDAO configurable via constructor args; fixed CredClient to put daysValid as param

moved ost of the internal code to cadcCDP-Server and re-org packages; made CredClient able to perform both CDP and get-proxy-cert actions