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Proposal to enable WAPBL by default for 10.0

I propose to enable WAPBL ("log" in fstab(5)) by default for 10.0 and newer.

WAPBL - Write Ahead Physical Block Logging file system journaling

More info on WAPBL in wapbl(4).

Rationale: the default filesystem (FFS) without WAPBL is more prone to
data loss.

A potential blocker:
panic: kernel diagnostic assertion "(wapbl_transaction_len(wl) <=
(wl->wl_circ_size - wl->wl_reserved_bytes))" failed: file
".../src/sys/kern/vfs_wapbl.c", line 1271 wapbl_end: current transaction
too big to flush

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