Hide role-allow rules while filtering for boolean

[cgzones]

Role allow rules are not allowed in conditional policies, thus they should not be shown when filtering for booleans.

E.g.:

$ sesearch --role_allow -b secure_mode policy.33
allow auditadm_r secadm_r;
allow auditadm_r sysadm_r;
allow auditadm_r system_r;
allow dbadm_r system_r;
allow logadm_r system_r;
allow secadm_r auditadm_r;
allow secadm_r sysadm_r;
allow staff_r auditadm_r;
allow staff_r dbadm_r;
allow staff_r secadm_r;
allow staff_r sysadm_r;
allow sysadm_r auditadm_r;
allow sysadm_r secadm_r;
allow sysadm_r staff_r;
allow sysadm_r system_r;
allow sysadm_r user_r;
allow system_r auditadm_r;
allow system_r dbadm_r;
allow system_r guest_r;
allow system_r logadm_r;
allow system_r nx_server_r;
allow system_r secadm_r;
allow system_r staff_r;
allow system_r sysadm_r;
allow system_r unconfined_r;
allow system_r user_r;
allow system_r webadm_r;
allow system_r xdm_r;
allow system_r xguest_r;
allow webadm_r system_r;

$ sesearch --type_member -b secure_mode policy.33
<empty>

[pebenito]

@cgzones please try out the above PR.

[cgzones]

LGTM, thanks.