VCL: add session namespace support.

Change-Id: I04f1b63e66260d99c0dd180b0295a55a9b750df7
Signed-off-by: Dave Wallace <dwallacelf@gmail.com>

src/vcl/vcl_test.conf

@@ -0,0 +1,31 @@
+# Test VPPCOM config file
+vcl {
+  heapsize 1
+  api-prefix daw  # this is a comment
+  uid 1020 this is also a comment.
+  gid 1020
+# This is yet another comment!
+  segment-baseva 0x300000000
+  segment-size 0x10000000
+  segment-size 268435456
+  add-segment-size 0x1000000
+  add-segment-size 134217728
+  preallocated-fifo-pairs 16
+  rx-fifo-size 3145728
+  rx-fifo-size 0x300000
+  tx-fifo-size 3145728
+  tx-fifo-size 0x300000
+  event-queue-size 1024
+  event-queue-size 0x400
+  listen-queue-size 32
+  listen-queue-size 0x20
+  app-timeout 54.3
+  session-timeout 66.6
+  accept-timeout 0.1
+  session-scope-local
+  session-scope-global
+  namespace-id 0123456789012345678901234567890123456789012345678901234567890123456789
+  namespace-id Oh_Bother!_Said_Winnie-The-Pooh
+  namespace-secret 0x42bada55e5
+  namespace-secret 42
+}