Exclude content not available with foremanctl

Author: aneta-petrova

guides/common/modules/ref_ipv6-and-ipv4-requirements.adoc

@@ -35,12 +35,16 @@ If you intend to provision hosts in an IPv6 network, the following requirements
 
 * Deploy an external DHCPv6 server and configure it manually to communicate with the network boot process and to manage IP address assignment because {Project} cannot integrate with a DHCPv6 server and manage its configuration.
 For more information about DHCPv6 server configuration, see {ProvisioningDocURL}options-in-unmanaged-dhcpv6[Options in unmanaged DHCPv6] in _{ProvisioningDocTitle}_.
+ifndef::installer-foremanctl[]
 * Configure {Project} for UEFI HTTP boot provisioning.
 Although {Project} provisioning templates include IPv6 support for PXE and HTTP (iPXE) provisioning, the UEFI HTTP Boot provisioning is the only tested and certified provisioning workflow.
 For more information, see xref:configuring-for-uefi-http-boot-provisioning-in-an-ipv6-network_{context}[].
+endif::[]
 
 .Additional resources
 ifdef::satellite[]
 * link:https://access.redhat.com/solutions/5045841[_How do I disable the IPv6 protocol on Red Hat Satellite and/or Red Hat Capsule server?_ in Red Hat Knowledgebase]
 endif::[]
+ifndef::installer-foremanctl[]
 * xref:adding-a-default-http-proxy_{context}[]
+endif::[]