Remove some "Env::close" noise from unit test output

src/test/rpc/Book_test.cpp

@@ -1670,12 +1670,17 @@ public:
         Env env{*this, asAdmin ? envconfig() : envconfig(no_admin)};
         Account gw{"gw"};
         env.fund(XRP(200000), gw);
-        env.close();
+        // Note that calls to env.close() fail without admin permission.
+        if (asAdmin)
+            env.close();
+
         auto USD = gw["USD"];
 
         for (auto i = 0; i <= RPC::Tuning::bookOffers.rmax; i++)
             env(offer(gw, XRP(50 + 1 * i), USD(1.0 + 0.1 * i)));
-        env.close();
+
+        if (asAdmin)
+            env.close();
 
         Json::Value jvParams;
         jvParams[jss::limit] = 1;

src/test/rpc/LedgerData_test.cpp

@@ -58,7 +58,9 @@ public:
             Account const bob{std::string("bob") + std::to_string(i)};
             env.fund(XRP(1000), bob);
         }
-        env.close();
+        // Note that calls to env.close() fail without admin permission.
+        if (asAdmin)
+            env.close();
 
         // with no limit specified, we get the max_limit if the total number of
         // accounts is greater than max, which it is here
@@ -107,7 +109,6 @@ public:
             Account const bob{std::string("bob") + std::to_string(i)};
             env.fund(XRP(1000), bob);
         }
-        env.close();
 
         // with no limit specified, we should get all of our fund entries
         // plus three more related to the gateway setup
@@ -212,7 +213,6 @@ public:
             Account const bob{std::string("bob") + std::to_string(i)};
             env.fund(XRP(1000), bob);
         }
-        env.close();
 
         // with no limit specified, we should get all of our fund entries
         // plus three more related to the gateway setup

src/test/rpc/LedgerRequestRPC_test.cpp

@@ -360,7 +360,6 @@ public:
         Account const gw{"gateway"};
         auto const USD = gw["USD"];
         env.fund(XRP(100000), gw);
-        env.close();
 
         auto const result = env.rpc("ledger_request", "1")[jss::result];
         // The current HTTP/S ServerHandler returns an HTTP 403 error code here