Remove config versioning

Summary:
Versioning configs is kind of backwards to the normal way of
doing things. People usually expect the code to be versioned, and configs
to target major release versions of code. Versioning the configs is sort
of like versioned symbols in that both parties (code and config) are
screwed in really tightly to each other.

Differential Revision: D14761961

fbshipit-source-id: f6e87aaec1473345c6f907fed0466079613ea359

config/ConfigCompiler.cpp

@@ -130,11 +130,6 @@ std::unique_ptr<Engine::Engine> compile(const IR::Root& root) {
   Engine::MonitoredResources resources;
   std::vector<std::unique_ptr<Engine::Ruleset>> rulesets;
 
-  if (root.version.empty()) {
-    OLOG << "No version string specified";
-    return nullptr;
-  }
-
   for (const auto& ruleset : root.rulesets) {
     auto compiled_ruleset = compileRuleset(resources, ruleset);
     if (!compiled_ruleset) {

config/ConfigCompilerTest.cpp

@@ -149,7 +149,6 @@ class CompilerTest : public ::testing::Test {
  public:
   CompilerTest() {
     count = 0;
-    root.version = "1.0.0";
   }
 
   std::unique_ptr<::Oomd::Engine::Engine> compile() {

config/ConfigTypes.cpp

@@ -78,8 +78,6 @@ void dumpIR(const Root& root) {
     --indent;
   }
   --indent;
-
-  OLOG << getIndentSpaces(indent) << "Version=" << root.version;
 }
 
 } // namespace IR

config/ConfigTypes.h

@@ -64,7 +64,6 @@ struct Ruleset {
 
 struct Root {
   std::vector<Ruleset> rulesets;
-  std::string version;
 };
 
 void dumpIR(const Root& root);

config/JsonConfigParser.cpp

@@ -124,8 +124,6 @@ std::unique_ptr<IR::Root> JsonConfigParser::parse(const std::string& input) {
     ir_root->rulesets.emplace_back(parseRuleset(ruleset));
   }
 
-  ir_root->version = json_root.get("version", "").asString();
-
   IR::dumpIR(*ir_root);
   return ir_root;
 }

config/JsonConfigParserTest.cpp

@@ -26,7 +26,7 @@
 using namespace Oomd::Config2;
 using namespace testing;
 
-constexpr auto kConfig_1_0_0 = "oomd/fixtures/oomd_1_0_0.json";
+constexpr auto kConfig_1_0_0 = "oomd/fixtures/oomd.json";
 
 TEST(JsonConfigParserTest, LoadIR) {
   std::ifstream file(kConfig_1_0_0, std::ios::in);
@@ -41,7 +41,6 @@ TEST(JsonConfigParserTest, LoadIR) {
 
   // Check root values
   ASSERT_EQ(root->rulesets.size(), 2);
-  EXPECT_EQ(root->version, "1.0.0");
 
   // Check first ruleset
   const auto& first = root->rulesets[0];