FreeBSD_stable_10 - Build #1855 - Fixed

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FreeBSD_stable_10 - Build #1855 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_stable_10/1855/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_stable_10/1855/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_stable_10/1855/console

Change summaries:

291551 by rmacklem:
MFC: r290970
mnt_stat.f_iosize (which is used to set bo_bsize) must be set to
the largest size of buffer cache block or the mapping of the buffer
is bogus. When a mount with rsize=4096,wsize=4096 was done, f_iosize
would be set to 4096. This resulted in corrupted directory data, since
the buffer cache block size for directories is NFS_DIRBLKSIZ (8192).
This patch fixes the code so that it always sets f_iosize to at least
NFS_DIRBLKSIZ.

291548 by smh:
MFC r291004:

Fix early kernel dump via dumpdev env

Sponsored by:	Multiplay

291547 by smh:
MFC r288153:

Use kenv 'dumpdev' in the same way as etc/rc.d/dumpon

Sponsored by:	Multiplay