New Plugin: foreman_phpipam

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For the record, the Foreman core part has been merged and will be in Foreman 2.1:

External IPAM core feature merged

Hello all, after a long journey, I have merged External IPAM support into Foreman core. This work made by @grizzthedj defines an IPAM Smart Proxy API which allows Foreman to allocate IPv4 and IPv6 addresses from an external authority. There is currently no module in Smart Proxy core, there is an “incubating” plugin and reference implementation for phpIPAM. Long term goal would be to have some implementations battle tested and then we can select some of them to be shipped with smart proxy - in t…