Add username lookup fallback to creds

[sjanusz-r7]

Attempts to fix the Framework issue: rapid7/metasploit-framework#21098

Testing

• Checkout the PR: Add Kerberos type hashes to cracking metasploit-framework#20881
• Add this to framework's gemfile: gem 'metasploit-credential', git: 'https://github.com/sjanusz-r7/metasploit-credential', branch: 'username-credential-lookup'
• bundle
• bundle exec ./msfconsole -q
• Run through the steps from the issue report:

creds -d
creds add user:krb5tgs hash:\$krb5tgs\$23\$*user\$realm$test/spn*\$63386d22d359fe42230300d56852c9eb\$891ad31d09ab89c6b3b8c5e5de6c06a7f49fd559d7a9a3c32576c8fedf705376cea582ab5938f7fc8bc741acf05c5990741b36ef4311fe3562a41b70a4ec6ecba849905f2385bb3799d92499909658c7287c49160276bca0006c350b0db4fd387adc27c01e9e9ad0c20ed53a7e6356dee2452e35eca2a6a1d1432796fc5c19d068978df74d3d0baf35c77de12456bf1144b6a750d11f55805f5a16ece2975246e2d026dce997fba34ac8757312e9e4e6272de35e20d52fb668c5ed jtr:krb5tgs
creds add user:krb5asrep hash:\$krb5asrep\$23\$user@domain.com:3e156ada591263b8aab0965f5aebd837\$007497cb51b6c8116d6407a782ea0e1c5402b17db7afa6b05a6d30ed164a9933c754d720e279c6c573679bd27128fe77e5fea1f72334c1193c8ff0b370fadc6368bf2d49bbfdba4c5dccab95e8c8ebfdc75f438a0797dbfb2f8a1a5f4c423f9bfc1fea483342a11bd56a216f4d5158ccc4b224b52894fadfba3957dfe4b6b8f5f9f9fe422811a314768673e0c924340b8ccb84775ce9defaa3baa0910b676ad0036d13032b0dd94e3b13903cc738a7b6d00b0b3c210d1f972a6c7cae9bd3c959acf7565be528fc179118f28c679f6deeee1456f0781eb8154e18e49cb27b64bf74cd7112a0ebae2102ac jtr:krb5asrep
use auxiliary/analyze/crack_windows
rm ~/.msf4/john.pot
set action john
set verbose true
rexploit
creds

• Confirm that both of the credentials have a cracked password:

id  host  origin  service  public     private                                                                                   realm  private_type        JtR Format  cracked_password
--  ----  ------  -------  ------     -------                                                                                   -----  ------------        ----------  ----------------
72                         krb5tgs    $krb5tgs$23$*user$realm$test/spn*$63386d22d359fe42230300d56852c9eb$891ad31d0 (TRUNCATED)         Nonreplayable hash  krb5tgs     hashcat
73                         krb5asrep  $krb5asrep$23$user@domain.com:3e156ada591263b8aab0965f5aebd837$007497cb51b6c (TRUNCATED)         Nonreplayable hash  krb5asrep   hashcat