* build: disable swarm packages

* build: remove allCrossCompiledArchiveFiles; inline allToolsArchiveFiles

* build: get rid of some superfluous comments

* add-date-to unstable

* fields-insteadof-split

* internal/build: support building with missing git

* docker: add git history back to support commit date in version

* internal/build: use PR commits hashes for PR builds

* travis, build: switch to NDK 19b, fix gomobile builds

* travis, build: move NDK into its final bundle location

* travis: disable Android build on PRs once again

* build: use sftp for launchpad uploads

* .travis.yml: configure sftp export

* build: update CI docs

dput --passive should make repo pushes from Travis work again.
dput --no-upload-log works around an issue I had while uploading locally.

debuild -d says that debuild shouldn't check for build dependencies when
creating the source package. This option is needed to make builds work
in environments where the installed Go version doesn't match the
declared dependency in the source package.

* add LGPL licence at update-licence.go

* add empty line

* travis: exclude non-test jobs for PRs

We don't usually look at these builders and not starting them
removes ~15min of build time.

* build: don't run vet before tests

Recent versions of Go run vet during 'go test' and we have
a dedicated lint job.

* build: use -timeout 5m for tests

Tests sometimes hang on Travis. CI runs are aborted after 10min with no
output. Adding the timeout means we get to see the stack trace for
timeouts.

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

This commit adds all changes needed for the merge of swarm-network-rewrite.
The changes:

- build: increase linter timeout
- contracts/ens: export ensNode
- log: add Output method and enable fractional seconds in format
- metrics: relax test timeout
- p2p: reduced some log levels, updates to simulation packages
- rpc: increased maxClientSubscriptionBuffer to 20000

Smaller size on mobile is always good.
Might also solve our maven central upload problem

* build: add GOBIN to PATH for gomobile

* build: install gobind alongside gomobile