Increase the default and minimum partition sizes. Bump / to 1GB, /var to 4GB and /tmp to 1GB.
Increase the default and minimum partition sizes.
Bump / to 1GB, /var to 4GB and /tmp to 1GB.

A 512MB root partition is now too small to hold two kernels, so to
prevent installkernel failing 1GB is a better default. Likewise,
applications are storing more data in /var so 4GB is more reasonable
on a modern machine.

The previous minimum partition sizes were too small to hold a minimal
installation, and have been adjusted accordingly.

Discussed with: rwatson, simon
Approved by: rrs (mentor)
MFC after: 1 week

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