Reduce console noise coming from unit tests:

A few unit tests have historically generated a lot of noise
to the console from log writes.  This noise was not useful
and made it harder to locate actual test failures.

By changing the log level of these tests from
- severities::kError to
- severities::kDisabled
it was possible to remove that noise coming from the logs.

src/test/ledger/View_test.cpp

@@ -130,6 +130,8 @@ class View_test : public beast::unit_test::suite
     void
     testLedger()
     {
+        testcase("Ledger");
+
         using namespace jtx;
         Env env(*this);
         Config config;
@@ -165,6 +167,8 @@ class View_test : public beast::unit_test::suite
     void
     testMeta()
     {
+        testcase("Meta");
+
         using namespace jtx;
         Env env(*this);
         wipe(env.app().openLedger());
@@ -196,6 +200,8 @@ class View_test : public beast::unit_test::suite
     void
     testMetaSucc()
     {
+        testcase("Meta succ");
+
         using namespace jtx;
         Env env(*this);
         wipe(env.app().openLedger());
@@ -260,6 +266,8 @@ class View_test : public beast::unit_test::suite
     void
     testStacked()
     {
+        testcase("Stacked");
+
         using namespace jtx;
         Env env(*this);
         wipe(env.app().openLedger());
@@ -325,6 +333,8 @@ class View_test : public beast::unit_test::suite
     void
     testContext()
     {
+        testcase("Context");
+
         using namespace jtx;
         using namespace std::chrono;
         {
@@ -387,6 +397,8 @@ class View_test : public beast::unit_test::suite
     void
     testUpperAndLowerBound()
     {
+        testcase("Upper and lower bound");
+
         using namespace jtx;
         Env env(*this);
         Config config;
@@ -654,6 +666,8 @@ class View_test : public beast::unit_test::suite
     void
     testSles()
     {
+        testcase("Sles");
+
         using namespace jtx;
         Env env(*this);
         Config config;
@@ -786,6 +800,8 @@ class View_test : public beast::unit_test::suite
     void
     testFlags()
     {
+        testcase("Flags");
+
         using namespace jtx;
         Env env(*this);
 
@@ -949,6 +965,8 @@ class View_test : public beast::unit_test::suite
     void
     testTransferRate()
     {
+        testcase("Transfer rate");
+
         using namespace jtx;
         Env env(*this);
 
@@ -975,12 +993,14 @@ class View_test : public beast::unit_test::suite
         // construct and manage two different Env instances at the same
         // time.  So we can use two Env instances to produce mutually
         // incompatible ledgers.
+        testcase("Are compatible");
+
         using namespace jtx;
         auto const alice = Account("alice");
         auto const bob = Account("bob");
 
         // The first Env.
-        Env eA(*this);
+        Env eA(*this, envconfig(), nullptr, beast::severities::kDisabled);
 
         eA.fund(XRP(10000), alice);
         eA.close();
@@ -990,9 +1010,13 @@ class View_test : public beast::unit_test::suite
         eA.close();
         auto const rdViewA4 = eA.closed();
 
-        // The two Env's can't share the same ports, so modifiy the config
+        // The two Env's can't share the same ports, so modify the config
         // of the second Env to use higher port numbers
-        Env eB{*this, envconfig(port_increment, 3)};
+        Env eB{
+            *this,
+            envconfig(port_increment, 3),
+            nullptr,
+            beast::severities::kDisabled};
 
         // Make ledgers that are incompatible with the first ledgers.  Note
         // that bob is funded before alice.
@@ -1029,6 +1053,8 @@ class View_test : public beast::unit_test::suite
     void
     testRegressions()
     {
+        testcase("Regressions");
+
         using namespace jtx;
 
         // Create a ledger with 1 item, put a