native-migration: pre-check if Gitaly and HGitaly are running

Also, added color to puts statements.

--HG--
branch : heptapod-stable
12 jobs for !278 with topic/heptapod-stable/native_followup in 14 minutes and 31 seconds (queued for 4 seconds)
detached
Status Job ID Name Coverage
  Lint
passed rubocop #244203

00:03:28

 
  Test
passed rspec-regular 1/8 #244207

00:08:52

passed rspec-regular 2/8 #244208

00:07:46

passed rspec-regular 3/8 #244209

00:06:09

passed rspec-regular 4/8 #244210

00:07:30

passed rspec-regular 5/8 #244211

00:11:01

passed rspec-regular 6/8 #244212

00:07:47

passed rspec-regular 7/8 #244213

00:07:23

passed rspec-regular 8/8 #244214

00:09:10

passed workhorse:test using go 1.15 #244205

00:01:39

passed workhorse:test using go 1.16 #244206

00:02:20

passed workhorse:verify #244204

00:01:37