Dependency Checking (#75)

* Adds req testing methodology, needs fixes

* Improves dependency exception handling

* Better meets_requirements implementation

Still need to adjust tests to fake installation

* Changes to exception boolean to enable tool check

tests and class variables modified for new tool check

* Adjust test_get_scans to use appropriate variable

* Adds Go requirement where relevant

* Adds missing scan dependencies

* Add clarification to error message

pipeline/recon-pipeline.py

@@ -298,10 +298,14 @@ class ReconShell(cmd2.Cmd):
         # get_scans() returns mapping of {classname: [modulename, ...]} in the recon module
         # each classname corresponds to a potential recon-pipeline command, i.e. AmassScan, GobusterScan ...
         scans = get_scans()
-
         # command is a list that will end up looking something like what's below
         # luigi --module pipeline.recon.web.webanalyze WebanalyzeScan --target abc.com --top-ports 100 --interface eth0
-        command = ["luigi", "--module", scans.get(args.scantype)[0]]
+        try:
+            command = ["luigi", "--module", scans.get(args.scantype)[0]]
+        except TypeError:
+            return self.poutput(
+                style(f"[!] {args.scantype} or one of its dependencies is not installed", fg="bright_red")
+            )
 
         tgt_file_path = None
         if args.target: