build: rename swarm deb package to ethereum-swarm; change swarm deb version from 1.8.x to 0.3.x (#16988)

* build: add support for different package and binary names

* build: bump up copyright date

* build: change default PackageName to empty string

* build, internal, swarm: enhance build/release process

* build: hack ethereum-swarm as a "depends" in deb package

* build/ci: remove redundant variables

* build, cmd, mobile, params, swarm: remove VERSION file; rename Version to VersionMeta;

* internal: remove VERSION() method which reads VERSION file

* build: fix VersionFilePath to Version

* Makefile: remove clean_go_build_cache.sh until it works

* Makefile: revert removal of clean_go_build_cache.sh

swarm/version/version.go

@@ -0,0 +1,64 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package version
+
+import (
+	"fmt"
+)
+
+const (
+	VersionMajor = 0          // Major version component of the current release
+	VersionMinor = 3          // Minor version component of the current release
+	VersionPatch = 1          // Patch version component of the current release
+	VersionMeta  = "unstable" // Version metadata to append to the version string
+)
+
+// Version holds the textual version string.
+var Version = func() string {
+	return fmt.Sprintf("%d.%d.%d", VersionMajor, VersionMinor, VersionPatch)
+}()
+
+// VersionWithMeta holds the textual version string including the metadata.
+var VersionWithMeta = func() string {
+	v := Version
+	if VersionMeta != "" {
+		v += "-" + VersionMeta
+	}
+	return v
+}()
+
+// ArchiveVersion holds the textual version string used for Swarm archives.
+// e.g. "0.3.0-dea1ce05" for stable releases, or
+//      "0.3.1-unstable-21c059b6" for unstable releases
+func ArchiveVersion(gitCommit string) string {
+	vsn := Version
+	if VersionMeta != "stable" {
+		vsn += "-" + VersionMeta
+	}
+	if len(gitCommit) >= 8 {
+		vsn += "-" + gitCommit[:8]
+	}
+	return vsn
+}
+
+func VersionWithCommit(gitCommit string) string {
+	vsn := Version
+	if len(gitCommit) >= 8 {
+		vsn += "-" + gitCommit[:8]
+	}
+	return vsn
+}