ec: Fix posix compliance failures

This patch solves some problems that caused dispersed volumes to not
pass posix smoke tests:

* Problems in open/create with O_WRONLY
    Opening files with -w- permissions using O_WRONLY returned an EACCES
    error because internally O_WRONLY was replaced with O_RDWR.

* Problems with entrylk on renames.
    When source and destination were the same, ec tried to acquire
    the same entrylk twice, causing a deadlock.

* Overwrite of a variable when reordering locks.
    On a rename, if the second lock needed to be placed at the beggining
    of the list, the 'lock' variable was overwritten and later its timer
    was cancelled, cancelling the incorrect one.

* Handle O_TRUNC in open.
    When O_TRUNC was received in an open call, it was blindly propagated
    to child subvolumes. This caused a discrepancy between real file
    size and the size stored into trusted.ec.size xattr. This has been
    solved by removing O_TRUNC from open and later calling ftruncate.

This is a backport of http://review.gluster.org/9420

Change-Id: I20c3d6e1c11be314be86879be54b728e01013798
BUG: 1159471
Signed-off-by: Xavier Hernandez <xhernandez@datalab.es>
Reviewed-on: http://review.gluster.org/9501
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Dan Lambright <dlambrig@redhat.com>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Reviewed-by: Raghavendra Bhat <raghavendra@redhat.com>

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