Drop root check

rpcbind needs to bind to port 111, which is a privileged port.  In
order to ensure that it can do this, rpcbind helpfully hardcodes a
check to ensure that geteuid() returns 0 instead of printing a message
only if it fails to bind to the correct port.

Remove this check so that we can run it as a non-root user.  It will
still be able to bind to port 111 since we will give it the
CAP_NET_BIND_SERVICE capability, which is really all it needs.

--- src/rpcbind.c	2016-11-28 12:47:28.000000000 -0800
+++ src/rpcbind.c.new	2017-11-13 15:32:42.344159067 -0800
@@ -171,11 +171,6 @@
 		setrlimit(RLIMIT_NOFILE, &rl);
 	}
 
-	if (geteuid()) { /* This command allowed only to root */
-		fprintf(stderr, "Sorry. You are not superuser\n");
-		exit(1);
-	}
-
 	/*
 	 * Make sure we use the local service file 
 	 * for service lookkups
@@ -268,18 +263,6 @@
 			mkdir_warmstart(p->pw_uid);
 		}
 #endif
-                if (setgid(p->pw_gid) == -1) {
-                        syslog(LOG_ERR, "setgid to '%s' (%d) failed: %m", id, p->pw_gid);
-                        exit(1);
-                }
-		if (setgroups(0, NULL) == -1) {
-			syslog(LOG_ERR, "dropping supplemental groups failed: %m");
-			exit(1);
-		}
-		if (setuid(p->pw_uid) == -1) {
-			syslog(LOG_ERR, "setuid to '%s' (%d) failed: %m", id, p->pw_uid);
-			exit(1);
-		}
 	}
 
 #ifdef WARMSTART