switch/nrt: treat --network=ip the same as --network=ipv4

doc/html/poe.shtml

@@ -44,6 +44,7 @@ SLURM_NETWORK environment variable. Supported network options include:</p>
 <ul>
 <li>Network protocol</li>
   <ul>
+  <li><b>ip</b> Internet protocol, version 4</li>
   <li><b>ipv4</b> Internet protocol, version 4 (default)</li>
   <li><b>ipv6</b> Internet protocol, version 6</li>
   <li><b>us</b> User Space protocol, may be combined with ibv4 or ipv6</li>

src/plugins/switch/nrt/switch_nrt.c

@@ -498,6 +498,8 @@ extern int switch_p_build_jobinfo(switch_jobinfo_t *switch_job, char *nodelist,
 			}
 
 		/* network options */
+		} else if (!strcasecmp(token, "ip")) {
+			ip_v4 = true;
 		} else if (!strcasecmp(token, "ipv4")) {
 			ip_v4 = true;
 		} else if (!strcasecmp(token, "ipv6")) {