Add getlocalsolps and getnetworksolps RPC calls, show them in getmininginfo

src/gtest/test_metrics.cpp

@@ -0,0 +1,30 @@
+#include <gtest/gtest.h>
+
+#include "metrics.h"
+#include "utiltime.h"
+
+
+TEST(Metrics, GetLocalSolPS) {
+    SetMockTime(100);
+    MarkStartTime();
+
+    // No time has passed
+    EXPECT_EQ(0, GetLocalSolPS());
+
+    // Increment time
+    SetMockTime(101);
+    EXPECT_EQ(0, GetLocalSolPS());
+
+    // Increment solutions
+    solutionTargetChecks.increment();
+    EXPECT_EQ(1, GetLocalSolPS());
+
+    // Increment time
+    SetMockTime(102);
+    EXPECT_EQ(0.5, GetLocalSolPS());
+
+    // Increment solutions
+    solutionTargetChecks.increment();
+    solutionTargetChecks.increment();
+    EXPECT_EQ(1.5, GetLocalSolPS());
+}