Storage Module Basis (#13)

* Added storage module, base structs, getDevices() func, taskGetStorageDevices (ticks every 30)

* GetDevices now returns a complete description w/ disk partitions

* Added InUse flag to Device, fixed logic bugs

* Added disk space usage for partitions in use by the system

* Cleanup

* Added UsageStat and UsageSplit filling for in use devices

* Changed value of lsblk block usage output to bytes

* Cleanup, small fixes

* Added ExecAndGetLines util func

* Added explicit detection of disk or part block type, ignoring non-suppoorted devices

* Added command line tool dependencies for the project in README file

* Added comment to func ExecAndGetLines

* Removed GetMySQLDbConnectionDetails()

* Added tests to utils module

* Fix invalid argument type for Exec family of tests

* Removed too much verbosity from utils.GetPath when no env file is available, added new argument (path) to Exec family of funcs

* Added new path argument to utils.Exec... test

* Fixed TestExec

* Added spaces trim to Exec result

* Trimming spaces and newlines from result of Exec

* Better visibility for test result log of TestExec

* Added ExampleExecAndStream test

* Added Example tests with failure status for ExecAndStream

* Added branch to test for valid key in GetPath

* Added missing t.Fail() statements in utils_test.go

* Added storage_test.go file, smoke test

* TestGetDevices

internal/storage/storage_test.go

@@ -0,0 +1,31 @@
+// +build unit
+
+package storage
+
+import (
+	"testing"
+)
+
+func TestGetDevices(t *testing.T) {
+	result := GetDevices()
+
+	if len(result) == 0 {
+		t.Log("Expecting at least 1 block device, 0 elements found in slice")
+		t.Fail()
+	}
+
+	foundDevice := false
+
+	t.Log("Looking for a mmcblk0 or sda device")
+	for _, device := range result {
+		if device.ID == "mmcblk0" || device.ID == "sda" {
+			t.Log("Found target device", device.ID)
+			foundDevice = true
+		}
+	}
+
+	if !foundDevice {
+		t.Log("Expected to find device mmcblk0 but did not. Devices:", result)
+		t.Fail()
+	}
+}