Testing and packaging changes for 2.0

[clintongormley]

This is a meta issue listing the testing and packaging we should add before 2.0:

• Extend integration testing to multi-node Extend integration testing to multi-node #12718 (Simon)
• Install and test core plugins in vagrant tests Install and test core plugins in vagrant tests #12717 (Nik)
• Test command line tools with custom paths Test command line tools with custom paths #12712 (Britta, PR Add integrations tests for installing plugins with custom options #12954)
• improve plugin integration tests improve plugin integration tests #12654 (Clint)
• Bats tests should use plugins built in the elasticsearch repository Bats tests should use plugins built in the elasticsearch repository #12651 (Nik)
• [cloud-gce] Move integration tests to unit tests [cloud-gce] Move integration tests to unit tests #12786 (David)
• try to improve integration tests setup/teardown try to improve integration tests setup/teardown #12063 (Britta, PR check with jps that the pid file contains a pid that actually is an e… #12961)
• Make sure all distribution modules have description in pom.xml Make sure all distribution modules have description in pom.xml #12550
• Don't expand wildcards in command line options Don't expand wildcards in command line options #12689 (depends on elasticsearch script does not work with arguments that have spaces #12677)
• elasticsearch script does not work with arguments that have spaces elasticsearch script does not work with arguments that have spaces #12677 (PR use spaces liberally in integration tests and fix space handling #12710)
• Add "name" to the plugin descriptor file Add "name" to the plugin descriptor file #12715 (cbuescher, PR Use 'name' from plugin descriptor file to determine plugin name #12775)
• Plugin manager should verify that it can write to all directories Plugin manager should verify that it can write to all directories #12749 (AlexR, PR PluginManager: Dont leave leftover files on unsuccessful installs #12851)
• Plugin manager should download only from https by default Plugin manager should download only from https by default #12748 (AlexR, PR Replace HTTP urls with HTTPS in PluginManager #12824)
• Plugin manager should validate the SHA, where possible Plugin manager should validate the SHA, where possible #12750 (Lee, PR Validate checksums for plugins if available #12888)
• Plugin script fails when memory parameters are defined in environment file Plugin script fails when memory parameters are defined in environment file #12479 (AlexR, PR Remove unused java opts/es java opts from plugin manager call #12801)
• Make sure elasticsearch.bat works with spaces Make sure elasticsearch.bat works with spaces #12848 (Martijn L, PR cmd /C needs to be quoted as a whole when starting integration tests #12910)

[nik9000]

Finally closed #12717 today! Hurray!

[dadoonet]

Note that for #12719, I won't be able to make it for 2.0. So for now, we decided to do some manual testing.