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There are three types of value accepted by NETAUTO:
1) "dhcp" for automatic network settings via DHCP
2) "up" to bring link up, wait for IPv6 tentative and link up
operstate
3) anything else: apply static configuration, wait for IPv6
tentative and link up operstate
Note that empty ("") value is subset of 3) and we only skip link up
operstate monitoring for it since commit 3e89468cd0
("Don't require link-up on ma1 if NETAUTO is not specified.").
Add fourth case with NETAUTO=none to skip all but NETHW (hardware
address) from boot-config file and support different management
adapter config methods (e.g. Debian network config system).
This also fixes incorrect "return" statement usage outside of function
introduced with commit 3e89468cd0
("Don't require link-up on ma1 if NETAUTO is not specified.") and adds
newline before wait_link_up() to make code more readable.
Signed-off-by: Sergey Popovich <sergey.popovich@ordnance.co>