Hello @kwojcicki , thank you for this PR!
I can see the CI is failing on the validate step:

2019/02/05 04:56:25 WARNING: package github.com/Nvveen/Gotty is unused, consider removing it from vendor.conf

and on test step:

=== Failed
=== FAIL: cli/command/system TestPrettyPrintInfo/info_without_swarm (0.00s)
    --- FAIL: TestPrettyPrintInfo/info_without_swarm (0.00s)
        info_test.go:340: assertion failed:
            --- expected
            +++ actual
            @@ -8,4 +8,5 @@
               Stopped: 0
              Images: 0
            + Default Builder: Legacy
              Server Version: 17.06.1-ce
              Storage Driver: aufs
=== FAIL: cli/command/system TestPrettyPrintInfo/info_with_plugins (0.00s)
    --- FAIL: TestPrettyPrintInfo/info_with_plugins (0.00s)
        info_test.go:340: assertion failed:
            --- expected
            +++ actual
            @@ -10,4 +10,5 @@
               Stopped: 0
              Images: 0
            + Default Builder: Legacy
              Server Version: 17.06.1-ce
              Storage Driver: aufs
=== FAIL: cli/command/system TestPrettyPrintInfo/info_with_swarm (0.00s)
    --- FAIL: TestPrettyPrintInfo/info_with_swarm (0.00s)
        info_test.go:340: assertion failed:
            --- expected
            +++ actual
            @@ -8,4 +8,5 @@
               Stopped: 0
              Images: 0
            + Default Builder: Legacy
              Server Version: 17.06.1-ce
              Storage Driver: aufs
=== FAIL: cli/command/system TestPrettyPrintInfo/info_with_legacy_warnings (0.00s)
    --- FAIL: TestPrettyPrintInfo/info_with_legacy_warnings (0.00s)
        info_test.go:340: assertion failed:
            --- expected
            +++ actual
            @@ -8,4 +8,5 @@
               Stopped: 0
              Images: 0
            + Default Builder: Legacy
              Server Version: 17.06.1-ce
              Storage Driver: aufs
=== FAIL: cli/command/system TestPrettyPrintInfo/info_with_daemon_warnings (0.00s)
    --- FAIL: TestPrettyPrintInfo/info_with_daemon_warnings (0.00s)
        info_test.go:340: assertion failed:
            --- expected
            +++ actual
            @@ -8,4 +8,5 @@
               Stopped: 0
              Images: 0
            + Default Builder: Legacy
              Server Version: 17.06.1-ce
              Storage Driver: aufs
=== FAIL: cli/command/system TestPrettyPrintInfo/bad_security_info (0.00s)
    --- FAIL: TestPrettyPrintInfo/bad_security_info (0.00s)
        info_test.go:340: assertion failed:
            --- expected
            +++ actual
            @@ -8,4 +8,5 @@
               Stopped: 0
              Images: 0
            + Default Builder: Legacy
              Server Version: 17.06.1-ce
              Storage Driver: aufs