Added Groovy support for unit tests to pom with skeleton test.
Added Groovy unit tests for OCSPCertificateValidator.
Implemented positive & negative unit tests with cache injection for valid/revoked OCSP certificate.
Modified pom.xml to support Groovy unit tests with custom variable.
mvn clean test -Dgroovy=test
Added local cache injection into Groovy tests for OCSP certificate validation (see NIFI-1324 and NIFI-1364).
Set Java version to 1.7 for Groovy test src/target.
Moved Groovy unit test profile from nifi-web-security to root pom.
Added null check for algorithm argument in PGPUtil.
Changed buffer length check from ">= 0" to "> -1" because it was confusing other developers.
Resolved contrib-check line length issues.
Fixed contrib-check issues in OpenPGPKeyBasedEncryptorTest.
This closes#163
Signed-off-by: Matt Gilman <matt.c.gilman@gmail.com>