* cli: fixed remaining testability indirections for output and logging
* cli: added cli.RunSubcommand() which is used in testing to execute a subcommand in the same process
* tests: refactored most e2e tests to invoke kopia subcommands in-process
* Makefile: enable code coverage for cli/ and internal/
* testing: pass 'testing' tag to unit tests which uses much faster (insecure) password hashing scheme
* Makefile: push coverage from PRs again
* tests: disable buffer management to reduce memory usage on ARM
* cli: fixed misaligned atomic field on ARMHF
also temporarily fixed statup-time benign race condition when setting
default on the timeZone variable, which is the last global variable.
fcd507a56d