Add coverage results using additional rules directory

[fzipi]

As a security rules tester, I would like to have tests results coverage based on the tests and on the rules I am testing.

Requirements

• add an optional --coverage parameter, with a required additional --rules directory parameter that will contain rules.
• rules will be read from *.conf files in that directory
• a map will contain the rule identifiers as key
• for every test that starts with the ID of the rule, we add a counter or similar to the map
• after running all tests, we can display a summary of the map based on keys empty/with content.

Output

• summary of the tests run plus the coverage percentage based on the map

[fzipi]

Rules should have a classification also. For example, if the rule has a skip, then it might be difficult to test by the tool.