LU-12059 build: Update ZFS version to 0.7.13

LU-12059 build: Update ZFS version to 0.7.13

ZFS
 * test-runner: python3 support #8096
 * Fix flake 8 style warnings #7925 #7952
 * GCC 9.0: Fix ztest "directive argument is not a nul-terminated
   string" #8330
 * Linux 5.0 compat: Fix bio_set_dev() #8287
 * Linux 5.0 compat: Disable vector instructions on 5.0+ kernels
   #8259
 * Linux 5.0 compat: Fix SUBDIRs #8257
 * Linux 5.0 compat: Convert MS_* macros to SB_* #8264
 * Linux 5.0 compat: Use totalram_pages() #8263
 * Linux 5.0 compat: access_ok() drops 'type' parameter #8261
 * deadlock between mm_sem and tx assign in zfs_write() and page
   fault #7939
 * dkms: Enable debuginfo option to be set with zfs sysconfig file
   #8304
 * Bump commit subject length to 72 characters #8250
 * zfs.8 uses wrong snapshot names in Example 15 #8241
 * Add enclosure_symlinks option to vdev_id #8194
 * vdev_id: new slot type ses #6956
 * vdev_id: extension for new scsi topology #6592
 * Rename macro ZFS_MINOR due to Lustre conflict #8195
 * Add kernel module auto-loading #7287
 * Use autoconf variable for C preprocessor #8180
 * OpenZFS 9577 - remove zfs_dbuf_evict_key tsd #7602
 * Honor --with-mounthelperdir where applicable #6962
 * contrib/initramfs: switch to automake #6761

SPL
 * Linux 4.20 compat: Fix current_kernel_time() #8258
 * Linux 5.0 compat: Fix timespec_sub() tonyhutter/spl@a333b28
 * Linux 5.0 compat: Fix SUBDIRs #8257
 * Linux 5.0 compat: Use totalram_pages() #8263
 * deadlock between mm_sem and tx assign in zfs_write() and page
   fault #7939
 * Linux 4.18 compat: Use ktime_get_coarse_real_ts64() #8258
 * Use autoconf variable for C preprocessor #8180

Signed-off-by: Nathaniel Clark <nclark@whamcloud.com>
Change-Id: I73fa5c2a9ddcf19683229d6fb9e61ff0835639ff
Reviewed-on: https://review.whamcloud.com/34393
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>