Add some verbosity

Would be nice to know if you find a Jenkins box at all. Current output is:
```
msf auxiliary(jenkins_enum) > set RHOSTS 192.168.1.100
RHOSTS => 192.168.1.100
msf auxiliary(jenkins_enum) > set TARGETURI /
TARGETURI => /
msf auxiliary(jenkins_enum) > run

[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed
```
Only when verbosity is on does it give you anything.
```
msf auxiliary(jenkins_enum) > set VERBOSE true
VERBOSE => true
msf auxiliary(jenkins_enum) > run

[*] 192.168.1.100:80 - Jenkins Version - 1.5
[*] 192.168.1.100:80 - /script restricted (403)
[*] 192.168.1.100:80 - /view/All/newJob restricted (403)
[*] 192.168.1.100:80 - /asynchPeople/ restricted (403)
[*] 192.168.1.100:80 - /systemInfo restricted (403)
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed
```