Added a check for vars_get in msftidy

This PR adds a check for get variables in send_request_cgi and send_request_raw. vars_get should be used instead.

## Regex
The regex currently only works if the first parameter of send_request_* is "uri". If you have improvements to the regex, please share.

## Steps to reproduce

### Regex Test
- [x] http://rubular.com/r/42ee4ItKWO
- [x] https://www.debuggex.com/r/ChRP9iNkqVdGrwjh

### get_vars_check
- [x] Checkout branch
- [x] run msftidy against module directory
- [x] Check output if uri parameter contains GET parameters and no false positives are catched

### cleanup_text check
- [x] Checkout branch
- [x] run msftidy against module directory
- [x] Make sure no newlines are printed
- [x] Additional: comment out cleanup_text and watch the differences

## Example Output:
```
firefart@LinuxMint ~/Coding/metasploit-framework $ ./tools/msftidy.rb modules/ | grep vars_get
modules/auxiliary/admin/http/iomega_storcenterpro_sessionid.rb - [WARNING] Please use vars_get in send_request_cgi and send_request_raw: send_request_raw({ 'uri' => "/cgi-bin/makecgi-pro?job=show_home&session_id=#{x
modules/auxiliary/scanner/http/manageengine_deviceexpert_traversal.rb - [WARNING] Please use vars_get in send_request_cgi and send_request_raw: send_request_raw({ 'uri' => "/scheduleresult.de/?FileName=#{traverse
modules/auxiliary/scanner/oracle/spy_sid.rb - [WARNING] Please use vars_get in send_request_cgi and send_request_raw: send_request_raw({ 'uri' => '/servlet/Spy?format=raw&loginfo=true'
modules/auxiliary/scanner/sap/sap_smb_relay.rb - [WARNING] Please use vars_get in send_request_cgi and send_request_raw: send_request_raw({ 'uri' => '/sap/bw/xml/soap/xmla?sap-client=' + datastore['CLIENT'] + '&sap-language=EN'
modules/auxiliary/scanner/sap/sap_soap_bapi_user_create1.rb - [WARNING] Please use vars_get in send_request_cgi and send_request_raw: send_request_cgi({ 'uri' => '/sap/bc/soap/rfc?sap-client=' + datastore['CLIENT'] + '&sap-language=EN'
modules/auxiliary/scanner/sap/sap_soap_rfc_brute_login.rb - [WARNING] Please use vars_get in send_request_cgi and send_request_raw: send_request_cgi({ 'uri' => '/sap/bc/soap/rfc?sap-client=' + client + '&sap-language=EN'
modules/auxiliary/scanner/sap/sap_soap_rfc_dbmcli_sxpg_call_system_command_exec.rb - [WARNING] Please use vars_get in send_request_cgi and send_request_raw: send_request_cgi({ 'uri' => '/sap/bc/soap/rfc?sap-client=' + datastore['CLIENT'] + '&sap-language=EN'
modules/auxiliary/scanner/sap/sap_soap_rfc_dbmcli_sxpg_command_exec.rb - [WARNING] Please use vars_get in send_request_cgi and send_request_raw: send_request_cgi({ 'uri' => '/sap/bc/soap/rfc?sap-client=' + datastore['CLIENT'] + '&sap-language=EN'
modules/auxiliary/scanner/sap/sap_soap_rfc_ping.rb - [WARNING] Please use vars_get in send_request_cgi and send_request_raw: send_request_cgi({ 'uri' => '/sap/bc/soap/rfc?sap-client=' + client + '&sap-language=EN'
modules/auxiliary/scanner/sap/sap_soap_rfc_read_table.rb - [WARNING] Please use vars_get in send_request_cgi and send_request_raw: send_request_cgi({ 'uri' => '/sap/bc/soap/rfc?sap-client=' + datastore['CLIENT'] + '&sap-language=EN'
modules/auxiliary/scanner/sap/sap_soap_rfc_susr_rfc_user_interface.rb - [WARNING] Please use vars_get in send_request_cgi and send_request_raw: send_request_cgi({ 'uri' => '/sap/bc/soap/rfc?sap-client=' + datastore['CLIENT'] + '&sap-language=EN'
modules/auxiliary/scanner/sap/sap_soap_rfc_sxpg_call_system_exec.rb - [WARNING] Please use vars_get in send_request_cgi and send_request_raw: send_request_cgi({ 'uri' => '/sap/bc/soap/rfc?sap-client=' + datastore['CLIENT'] + '&sap-language=EN'
modules/auxiliary/scanner/sap/sap_soap_rfc_sxpg_command_exec.rb - [WARNING] Please use vars_get in send_request_cgi and send_request_raw: send_request_cgi({ 'uri' => '/sap/bc/soap/rfc?sap-client=' + datastore['CLIENT'] + '&sap-language=EN'
```