[server] set serial port fd back to blocking if necessary

[Damjan Jovanovic]

This fixes a regression caused by commit
f85437c57fb44d511db97edbaa5b1f8abfe75fd3 (bug 9356) where serial ports
break because they are not made blocking.

Changelog:
* Set serial port fd back to blocking if necessary

Damjan Jovanovic
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