OS-5221 nfs mount should work without /etc/nfssec.conf inside LX zoneroot
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>

*** 43,52 ****
--- 43,53 ----
  #include <string.h>
  #include <ctype.h>
  #include <stdlib.h>
  #include <syslog.h>
  #include <synch.h>
+ #include <zone.h>
  #include <rpc/rpc.h>
  #include <nfs/nfs_sec.h>
  #include <rpc/rpcsec_gss.h>
  #ifdef WNFS_SEC_NEGO
  #include "webnfs.h"
*** 705,720 ****
  get_seconfig(int whichway, char *name, int num,
                  rpc_gss_service_t service, seconfig_t *entryp)
  {
          char    line[BUFSIZ];   /* holds each line of NFSSEC_CONF */
          FILE    *fp;            /* file stream for NFSSEC_CONF */
  
          if ((whichway == GETBYNAME) && (name == NULL))
                  return (SC_NOTFOUND);
  
          (void) mutex_lock(&matching_lock);
!         if ((fp = fopen(NFSSEC_CONF, "r")) == NULL) {
                  (void) mutex_unlock(&matching_lock);
                  return (SC_OPENFAIL);
          }
  
          while (fgets(line, BUFSIZ, fp)) {
--- 706,726 ----
  get_seconfig(int whichway, char *name, int num,
                  rpc_gss_service_t service, seconfig_t *entryp)
  {
          char    line[BUFSIZ];   /* holds each line of NFSSEC_CONF */
          FILE    *fp;            /* file stream for NFSSEC_CONF */
+         char    nfssec_conf[MAXPATHLEN];
+         const char *zroot = zone_get_nroot();
  
          if ((whichway == GETBYNAME) && (name == NULL))
                  return (SC_NOTFOUND);
  
+         (void) snprintf(nfssec_conf, sizeof (nfssec_conf), "%s%s", zroot != NULL ?
+             zroot : "", NFSSEC_CONF);
+ 
          (void) mutex_lock(&matching_lock);
!         if ((fp = fopen(nfssec_conf, "r")) == NULL) {
                  (void) mutex_unlock(&matching_lock);
                  return (SC_OPENFAIL);
          }
  
          while (fgets(line, BUFSIZ, fp)) {