Foreman » Smart Proxy

Fixes #22292 - Config option for tftp timeout

Smart proxy TFTP plugin uses wget to download initrd, vmlinuz,
squash.img etc. It by default uses a connection/dns and
read timeout of 10 seconds.
This commit enables one to the set the individual time outs via config...

Fixes #992 - Make NFS a recognized protocol

fixes #16009 - added support for native iPXE variant

fixes #15985 - Pxegrub2 tftp filename prefix

Fixes #15864 - Pxelinux alias variant for Syslinux

Fixes #12633 - Pxegrub2 variant and multiple configs

Fixes #14618 - refactored module initialization

to allow for:
    - support for multiple simultaneous providers
    - programmatically defined settings
    - custom validators
    - ability to customize module loading

Also includes support for constructor-based dependency injection

Fixes #14931 - TFTP class instantiating fixed

Fixes #11318 - HttpDownloads.start_download returns instance

instead of `true`. Allows to join processes, useful for discovery image
plugin.

Fixes #11103: tftp tests no longer fail when module config file contains changes.