milo: put line breaks between step text strings

appengine/cmd/milo/frontend/testdata/build-patch-failure

 Running: gclient root
 Running: gclient config --spec 'solutions = [
   {
     "url": "https://chromium.googlesource.com/infra/infra.git",
     "managed": False,
     "name": "infra",
     "deps_file": ".DEPS.git",
   },
 ]
 '
@@ skipping 1438 matching lines @@
 @@@STEP_LOG_LINE@run_recipe@@@@
 
 @@@STEP_LOG_LINE@run_recipe@To run on Windows, you can put the JSON in a file and redirect the@@@
 
 @@@STEP_LOG_LINE@run_recipe@contents of the file into run_recipe.py, with the < operator.@@@
 
 @@@STEP_LOG_END@run_recipe@@@
 
 Running recipe with {u'buildername': u'Infra Linux Trusty 64 Tester', u'recipe': 'infra/infra_repo_trybot', u'mastername': u'tryserver.infra', u'buildnumber': 1, u'slavename': u'fakeslave', u'patchset': 1, u'issue': 1431683003, u'patch_project': u'infra', u'revision': u'HEAD'}
 
-@@@STEP_TEXT@<br/>running recipe: "infra/infra_repo_trybot"@@@
+@@@STEP_TEXT@running recipe: "infra/infra_repo_trybot"@@@
 
 @@@STEP_CURSOR setup_build@@@
 
 @@@STEP_CLOSED@@@
 
 @@@SEED_STEP bot_update@@@
 
 @@@STEP_CURSOR bot_update@@@
 
 @@@STEP_STARTED@@@
@@ skipping 4396 matching lines @@
 
 @@@STEP_CLOSED@@@
 Traceback (most recent call last):
   File "luci_recipe_run.py", line 81, in <module>
     sys.exit(main(sys.argv[1:]))
   File "luci_recipe_run.py", line 78, in main
     subprocess.check_call(cmd, cwd=work_dir)
   File "/usr/lib/python2.7/subprocess.py", line 540, in check_call
     raise CalledProcessError(retcode, cmd)
 subprocess.CalledProcessError: Command '['/home/chrome-bot/infra-python/ENV/bin/python', '-u', '../../../scripts/slave/annotated_run.py', '--factory-properties-gz=eJyrVipKTc4sSFWyUlDKzEsrStQHk/FFqQX58SVFlUn5JUq1APnTDbo=', '--build-properties-gz=eJw9zsEKwjAMBuBXKT2LbmwM2U1QmOBx99HNDKtbW5J0OMR3d63OSw4/X/7kJVuvhyugUSPIUsiz6VGJizb+KWr0xLMoclEDMaDcCInQaRelDnIXZ4PgbMM4t5YDGlXga+WSE+AEuI04gHjU+LFdSkuRLgkNaoJ1o1cPiEGwTnF3I+Af1EQ+oDTP0mKfJUm2msahvUPH/+e+/06atDUhrE6Ho3x/AAlJTyU=']' returned non-zero exit status 1