Restructure code for more testaability

Move a number of funcs/files in the top-level `main` package into a new
`util` package, so test logic can directly invoke functions like
RunMark(), etc.  The main.go has been trimmed down to minimal sizing,
with former supporting funcs moved into `util` package, so they
can be run by unit tests.

Signed-off-by: Rich Scott <richscott@sent.com>

util/error_handler.go

@@ -0,0 +1,34 @@
+package util
+
+import (
+	"fmt"
+
+	"github.com/reconquest/pkg/log"
+)
+
+type FatalErrorHandler struct {
+	ContinueOnError bool
+}
+
+func NewErrorHandler(continueOnError bool) *FatalErrorHandler {
+	return &FatalErrorHandler{
+		ContinueOnError: continueOnError,
+	}
+}
+
+func (h *FatalErrorHandler) Handle(err error, format string, args ...interface{}) {
+
+	if err == nil {
+		if h.ContinueOnError {
+			log.Error(fmt.Sprintf(format, args...))
+			return
+		}
+		log.Fatal(fmt.Sprintf(format, args...))
+	}
+
+	if h.ContinueOnError {
+		log.Errorf(err, format, args...)
+		return
+	}
+	log.Fatalf(err, format, args...)
+}