Add boot_hrtime to global and zone kstats.

*** 20,29 ****
--- 20,30 ----
   */
  
  /*
   * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright 2013, Joyent Inc. All rights reserved.
+  * Copyright 2016 Garrett D'Amore
   */
  
  /*
   * Zones
   *
*** 1835,1844 ****
--- 1836,1847 ----
          zmp->zm_stime.value.ui64 = tmp;
          tmp = zone->zone_wtime;
          scalehrtime(&tmp);
          zmp->zm_wtime.value.ui64 = tmp;
  
+         zmp->zm_boot_hrtime.value.t = zone->zone_boot_hrtime;
+ 
          zmp->zm_avenrun1.value.ui32 = zone->zone_avenrun[0];
          zmp->zm_avenrun5.value.ui32 = zone->zone_avenrun[1];
          zmp->zm_avenrun15.value.ui32 = zone->zone_avenrun[2];
  
          zmp->zm_ffcap.value.ui32 = zone->zone_ffcap;
*** 1882,1891 ****
--- 1885,1895 ----
          kstat_named_init(&zmp->zm_ffcap, "forkfail_cap", KSTAT_DATA_UINT32);
          kstat_named_init(&zmp->zm_ffnoproc, "forkfail_noproc",
              KSTAT_DATA_UINT32);
          kstat_named_init(&zmp->zm_ffnomem, "forkfail_nomem", KSTAT_DATA_UINT32);
          kstat_named_init(&zmp->zm_ffmisc, "forkfail_misc", KSTAT_DATA_UINT32);
+         kstat_named_init(&zmp->zm_boot_hrtime, "boot_hrtime", KSTAT_DATA_TIME);
  
  
          ksp->ks_update = zone_misc_kstat_update;
          ksp->ks_private = zone;
  
*** 3963,3972 ****
--- 3967,3977 ----
                          mutex_enter(&zone_status_lock);
                          zone_status_set(zone, ZONE_IS_SHUTTING_DOWN);
                          mutex_exit(&zone_status_lock);
                  } else {
                          zone->zone_boot_time = gethrestime_sec();
+                         zone->zone_boot_hrtime = gethrtime();
                  }
  
                  pool_unlock();
          }