REGTEST/MINOR: Add a new class of regression testing files.

Add LEVEL #4 regression testing files which is dedicated to
VTC files in relation with bugs they help to reproduce.
At the date of this commit, all VTC files are LEVEL 4 VTC files.
diff --git a/reg-tests/lua/h00000.lua b/reg-tests/lua/b00000.lua
similarity index 100%
rename from reg-tests/lua/h00000.lua
rename to reg-tests/lua/b00000.lua
diff --git a/reg-tests/lua/h00000.vtc b/reg-tests/lua/b00000.vtc
similarity index 97%
rename from reg-tests/lua/h00000.vtc
rename to reg-tests/lua/b00000.vtc
index 2b2ffb0..4229eeb 100644
--- a/reg-tests/lua/h00000.vtc
+++ b/reg-tests/lua/b00000.vtc
@@ -40,7 +40,7 @@
 
 haproxy h1 -conf {
     global
-        lua-load ${testdir}/h00000.lua
+        lua-load ${testdir}/b00000.lua
 
     frontend fe1
         mode http