updates to accounts_password_pam_dcredit

- Updates XCCDF/OVAL to accounts_password_pam_dcredit from accounts_password_pam_cracklib_dcredit
- Updated OVAL naming schemes (e.g. variable name)
- Updated OVAL to reflect RHEL7
- Updated XCCDF to reflect pam_pwquality not pam_cracklib
adding remediation for file_owner_etc_group.sh
bash remediations for file_owner_etc_group
added remediation for file_groupowner_etc_group.sh
Merge pull request #264 from shawndwells/accounts_password_pam_dcredit

OVAL updates for accounts_password_pam_dcredit
Merge pull request #269 from shawndwells/bash-file_owner_etc_group

remediation for file_owner_etc_group
Merge pull request #270 from shawndwells/bash-file_groupowner_etc_group

added remediation for file_groupowner_etc_group