Fixed parentheses in get_aaa_password
Use $self->{NAME} in get_cw_password
Error messages: could not -> can't
New format for aaa_credentials file

- multiple lines
- three fields, separated by whitespace: pattern username password
- If current device name matches pattern, then return username and password.
- Pattern may contain shell wildcard characters
  * matches zero or more characters
  ? matches one character
- First matching line is taken.

Old format is still supported
- Only a single line with two fields: "username password"
- is equivalent to "* username password"
Added protocol 'icmp6' => 58
Fix typo in sub match
Fixed reader for new format of aaa_credentials file
v1.077

 - Added protocol name 'icmp6' => 58 for Cisco devices.
 - New format for aaa_credentials file
   - multiple lines
   - three fields, separated by whitespace: pattern username password
   - If current device name matches pattern, then return username and password.
   - Pattern may contain shell wildcard characters
     * matches zero or more characters
     ? matches one character
   - First matching line is taken.
   Old format is still supported
   - Only a single line with two fields: "username password"
   - is equivalent to "* username password"