Land #10797, Add docs for auxiliary/scanner/sip/options_tcp module

documentation/modules/auxiliary/scanner/sip/options_tcp.md

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+## Vulnerable Application
+
+  SIP is a signaling protocol for voice, and video typically associated with VOIP and typically used in commercial
+  phone systems.  SIP and VOIP are gaining popularity with home and cellular voice/video calling systems as well.
+
+  This module scans the TCP port to identify what OPTIONS are available on the SIP service.
+
+## Verification Steps
+
+  1. Start msfconsole
+  2. Do: ```use auxiliary/scanner/sip/options_tcp```
+  3. Do: ```set rhosts [ip]```
+  4. Do: ```run```
+
+## Scenarios
+
+### Cisco UC520
+
+
+```
+msf5 > use auxiliary/scanner/sip/options_tcp 
+msf5 auxiliary(scanner/sip/options_tcp) > set rhosts 2.2.2.2
+rhosts => 2.2.2.2
+msf5 auxiliary(scanner/sip/options_tcp) > run
+
+[*] 2.2.2.2:5060    - 2.2.2.2:5060 tcp SIP/2.0 200 OK: {"Server"=>"Cisco-SIPGateway/IOS-12.x", "Allow"=>"INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER"}
+[*] 2.2.2.2:5060    - Scanned 1 of 1 hosts (100% complete)
+[*] Auxiliary module execution completed
+```
+
+## Confirming using NMAP
+
+Utilizing the [sip-methods](https://nmap.org/nsedoc/scripts/sip-methods.html) script
+
+```
+nmap --script=sip-methods -p 5060 2.2.2.2
+
+Starting Nmap 7.70 ( https://nmap.org ) at 2018-10-11 15:44 EDT
+Nmap scan report for 2.2.2.2
+Host is up (0.0036s latency).
+
+PORT     STATE SERVICE
+5060/tcp open  sip
+|_sip-methods: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
+MAC Address: 00:1B:8F:AA:AA:AA (Cisco Systems)
+```
+