Fix elasticsearch traversal check support

[adfoster-r7]

Fixes the check method for scanner/http/elasticsearch_traversal

Verification

Before:

msf auxiliary(scanner/http/elasticsearch_traversal) > check rhost=127.0.0.1
[*] 127.0.0.1:9200 - This module does not support check.

Check code bug fix:

msf auxiliary(scanner/http/elasticsearch_traversal) > check 127.0.0.1
[-] Auxiliary failed: NoMethodError undefined method `body' for nil
[-] Call stack:
[-]   /Users/user/Documents/code/metasploit-framework/modules/auxiliary/scanner/http/elasticsearch_traversal.rb:63:in `check_host'
[-]   /Users/user/Documents/code/metasploit-framework/lib/msf/core/auxiliary/multiple_target_hosts.rb:23:in `check'
[-] 127.0.0.1:9200 - Check failed: The state could not be determined.

Module bug fix:

msf auxiliary(scanner/http/elasticsearch_traversal) > recheck 127.0.0.1
[*] Reloading module...
[*] 127.0.0.1:9200 - Cannot reliably check exploitability. Failed to connect to the target.

Vuln target:

msf auxiliary(scanner/http/elasticsearch_traversal) > check 10.140.113.233
[*] 10.140.113.233:9200 - The target appears to be vulnerable. Successfully created snapshot repositories, suggesting the Snapshot API is vulnerable to CVE-2015-5531.

[adfoster-r7]

Release notes

Fixes a bug when running the check method for scanner/http/elasticsearch_traversal against non-vulnerable targets

[adfoster-r7]

This was hiding real check attempts failing

[adfoster-r7]

Release Notes

Fixes a bug that incorrectly marked modules not having a check method present when targeting non-vulnerable targets in some scenarios. Also improves the check method for scanner/http/elasticsearch_traversal