feat(version): Makefile and version enhancement

Make to run go test for executing  unit test cases.

Removed version file, now if travis tag is set,
the VERSION will be set to that tag. And if travis
tag is not set, the driver version will be set to

 <branch-name>:<short commit hash>:<build date>

Signed-off-by: Pawan <pawan@mayadata.io>

Makefile

@@ -1,6 +1,8 @@
 # list only csi source code directories
 PACKAGES = $(shell go list ./... | grep -v 'vendor\|pkg/generated')
 
+UNIT_TEST_PACKAGES = $(shell go list ./... | grep -v 'vendor\|pkg/generated\|tests')
+
 # Lint our code. Reference: https://golang.org/cmd/vet/
 VETARGS?=-asmdecl -atomic -bool -buildtags -copylocks -methods \
          -nilfunc -printf -rangeloops -shift -structtags -unsafeptr
@@ -36,7 +38,7 @@ CSI_DRIVER=zfs-driver
 BUILD_DATE = $(shell date +'%Y%m%d%H%M%S')
 
 .PHONY: all
-all: zfs-driver-image
+all: test zfs-driver-image
 
 .PHONY: clean
 clean:
@@ -54,7 +56,7 @@ format:
 .PHONY: test
 test: format
 	@echo "--> Running go test" ;
-	@go test $(PACKAGES)
+	@go test $(UNIT_TEST_PACKAGES)
 
 # Bootstrap downloads tools required
 # during build