Added getShortName() method to LabelVerifierDescriptor

Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>
Added tests for RegexNameVerifier

Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>
Modified messages.

Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>