clean-up trailing whitespace (#453)

These changes have been mostly auto-generated with:

	find . -type f -print0 | xargs -0 perl -pi -e 's/ +$//'

Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>

exercises/load_balance/load_balance.p4

@@ -102,7 +102,7 @@ control MyIngress(inout headers hdr,
         mark_to_drop(standard_metadata);
     }
     action set_ecmp_select(bit<16> ecmp_base, bit<32> ecmp_count) {
-        /* TODO: hash on 5-tuple and save the hash result in meta.ecmp_select 
+        /* TODO: hash on 5-tuple and save the hash result in meta.ecmp_select
            so that the ecmp_nhop table can use it to make a forwarding decision accordingly */
     }
     action set_nhop(bit<48> nhop_dmac, bit<32> nhop_ipv4, bit<9> port) {
@@ -133,8 +133,8 @@ control MyIngress(inout headers hdr,
     }
     apply {
         /* TODO: apply ecmp_group table and ecmp_nhop table if IPv4 header is
-	 * valid and TTL hasn't reached zero
-	 */
+         * valid and TTL hasn't reached zero
+         */
     }
 }
 
@@ -173,10 +173,10 @@ control MyEgress(inout headers hdr,
 
 control MyComputeChecksum(inout headers hdr, inout metadata meta) {
      apply {
-	update_checksum(
-	    hdr.ipv4.isValid(),
+        update_checksum(
+            hdr.ipv4.isValid(),
             { hdr.ipv4.version,
-	      hdr.ipv4.ihl,
+              hdr.ipv4.ihl,
               hdr.ipv4.diffserv,
               hdr.ipv4.totalLen,
               hdr.ipv4.identification,