Bug 1234954 - Use LooseVersion for parsing Mercurial version; r=me

StrictVersion is strict about version strings, insisting on whatever
convention Python uses. LooseVersion is not as strict but is strict
enough for our use cases.

DONTBUILD (NPOTB)

--HG--
extra : commitid : 17lNEAJhaV0
extra : rebase_source : 0a0cefa47b4558401cb85c6e9b237c0d6cf0e7fb
extra : amend_source : c7360d1a2f934338ec04d5f384d4530e3e9ebbc5

python/mozboot/mozboot/base.py

@@ -10,7 +10,6 @@ import subprocess
 import sys
 
 from distutils.version import LooseVersion
-from distutils.version import StrictVersion
 
 
 NO_MERCURIAL = '''
@@ -76,7 +75,7 @@ We recommend the following tools for installing Python:
 # Upgrade Mercurial older than this.
 # This should match OLDEST_NON_LEGACY_VERSION from
 # tools/mercurial/hgsetup/wizard.py.
-MODERN_MERCURIAL_VERSION = StrictVersion('3.5.2')
+MODERN_MERCURIAL_VERSION = LooseVersion('3.5.2')
 
 # Upgrade Python older than this.
 MODERN_PYTHON_VERSION = LooseVersion('2.7.3')
@@ -294,7 +293,7 @@ class BaseBootstrapper(object):
             print('ERROR: Unable to identify Mercurial version.')
             return True, False, None
 
-        our = StrictVersion(match.group(1))
+        our = LooseVersion(match.group(1))
 
         return True, our >= MODERN_MERCURIAL_VERSION, our