This commit adds support for skipping test cases that have enabled=0 in
their JSON body.
A separate counter is kept and reported in the final non-automake
output, detailing disabled as a separate field.
Ref: #1513
If a given resource is not available the test is skipped. Useful
to test operators that depends on 3rd party libraries that may
not be available, for instance: GeoIP.
The server ID is a sha-1 identifier generated from the mac address of the first
ethernet device plus the server name. The process is the same used by
ModSecurity 2.9