Revert "LU-5654 osd-ldiskfs: Handle holes in osd_ldiskfs_read()"

Adds problems dcocumented in LU-5684

This reverts commit b5485d307568af92e1a940fa4a7859e6db5b7a97.
Revert "LU-5521 grant: quiet message on grant waiting timeout"

This is causing problems with LU-5656 and a lot of dmesg spam about
unterminated strings like
format at osc_cache.c:1524:osc_enter_cache doesn't end in newline

This reverts commit 150246e73c925d628ce9cbbd8184c0b0eefc9a16.

Conflicts:
	lustre/osc/osc_cache.c

Change-Id: Ie6dee548a8984b5cb51effcfa9427ffcfbf31f74