Remove gzip steps

The steps gzipping build logs did not have logfiles listed, so they were
not available for download from the web interface. The only way to get
the logs is via ssh/scp, which works just as well for non-gzipped logs.

This will cut down on build times.

buildbot/master/files/config/master.cfg

@@ -123,14 +123,12 @@ linux_rel_factory = create_servo_factory([
                        env=linux_headless_env,
                        logfiles={"test-wpt.log": "test-wpt.log",
                                  "wpt_errorsummary.log": "wpt_errorsummary.log"}),
-    steps.ShellCommand(command=["gzip", "test-wpt.log"], env=linux_headless_env),
     steps.ShellCommand(command=["./mach", "test-css", "--release", "--processes", "16",
                                 "--log-raw", "test-css.log",
                                 "--log-errorsummary", "css_errorsummary.log"],
                        env=linux_headless_env,
                        logfiles={"test-css.log": "test-css.log",
                                  "css_errorsummary.log": "css_errorsummary.log"}),
-    steps.ShellCommand(command=["gzip", "test-css.log"], env=linux_headless_env),
     steps.Compile(command=["./mach", "build-cef", "--release"], env=linux_headless_env),
     steps.Compile(command=["./mach", "build-geckolib", "--release"], env=linux_headless_env),
     steps.ShellCommand(command=["bash", "./etc/ci/lockfile_changed.sh"], env=linux_headless_env),
@@ -148,7 +146,6 @@ mac_rel_wpt_factory = create_servo_factory([
                        env=mac_test_env,
                        logfiles={"test-wpt.log": "test-wpt.log",
                                  "wpt_errorsummary.log": "wpt_errorsummary.log"}),
-    steps.ShellCommand(command=["gzip", "test-wpt.log"], env=mac_test_env),
     steps.ShellCommand(command=["./mach", "build-cef", "--release"], env=mac_test_env),
     steps.ShellCommand(command=["bash", "./etc/ci/lockfile_changed.sh"], env=mac_test_env),
     steps.ShellCommand(command=["bash", "./etc/ci/manifest_changed.sh"], env=mac_test_env),
@@ -171,7 +168,6 @@ mac_rel_css_factory = create_servo_factory([
                        env=mac_test_env,
                        logfiles={"test-css.log": "test-css.log",
                                  "css_errorsummary.log": "css_errorsummary.log"}),
-    steps.ShellCommand(command=["gzip", "test-css.log"], env=mac_test_env),
     steps.ShellCommand(command=["./mach", "build-geckolib", "--release"], env=mac_test_env),
     steps.ShellCommand(command=["bash", "./etc/ci/lockfile_changed.sh"], env=mac_test_env),
     steps.ShellCommand(command=["bash", "./etc/ci/manifest_changed.sh"], env=mac_test_env),