[enhancement] Add OVAL for ftp_present_banner and ftp_log_transactions

- add OVAL for ftp_present_banner and enable for RHEL 6 & 7 and Fedora 20
- add OVAL for ftp_log_transactions and enable for RHEL 6 & 7 and Fedora 20
Update ftp.xml
Updated IPTables OVAL

- Aligned XCCDF/OVAL namings
- Updated test/obj names within set_iptables_default_rule
- Created new OVAL set_iptables_default_rule_forward, updated XCCDF to use

make content ; make validate
Added remediation for IPTables default_rule, default_rule_forward
New OVAL for set_ip6tables_default_rule

- Created OVAL for set_ip6tables_default_rule.xml
- Created bash remediation
- Updated XCCDF to use OVAL
Fix filetype for set_iptables_default_rule_forward.sh
[Enhancement] Fedora FTP support

- Enable Fedora support
- Add missing vsftpd OVAL check
xccdf rename sysctl_ipv4_all_send_redirects -> sysctl_net_ipv4_conf_all_send_redirects

Renamed to follow sysctl naming scheme. Alignment properly pulls in remediation now.
XCCDF rename, sysctl_ipv6_default_accept_redirects -> sysctl_net_ipv6_conf_default_accept_redirects

Renamed to follow sysctl naming standards. Change properly pulls in remediation content as well.
Merge pull request #24 from redhatrises/add-ftp-banners

[Enhancement] Add OVAL for ftp_present_banner and ftp_log_transactions checks
Merge pull request #25 from shawndwells/iptables-cleanup

IPTables section cleanup
Merge pull request #26 from shawndwells/sysctl-fixes-20140820

Updating sysctl XCCDF naming