[metasploit] The snmp_enumshares signature is broken

[DePierre]

The snmp_enumshares signature is ' - ' in order to match the enumeration of the shares.

But when the module fails because the connection is refused, this signature also matches:

[*] Initializing modules...
^[[0m^[[0mRHOSTS => 127.0.0.1
^[[0mRPORT => 161
^[[0m^[[1m^[[34m[*]^[[0m Error: 127.0.0.1: Errno::ECONNREFUSED Connection refused - recvfrom(2)
^[[1m^[[34m[*]^[[0m Scanned 1 of 1 hosts (100% complete)
^[[1m^[[34m[*]^[[0m Auxiliary module execution completed
^[[0m

For now, 448187c removes the broken signature (which by the way breaks one unit test case).