Replace some os.mkdir with os.makedirs

These are using "if not exists create" and that can race unless
makedirs with exist_ok is used.

python/eups/db/Database.py

@@ -458,7 +458,7 @@ def declare(self, product):
 
         # seal the deal
         if not os.path.exists(pdir):
-            os.mkdir(pdir)
+            os.makedirs(pdir, exist_ok=True)
 
         if prod.dir:
             trimDir = prod.stackRoot()
@@ -725,5 +725,3 @@ def _cmp_str(a, b):
     if a < b:  return -1
     if a > b:  return 1
     return 0
-
-

python/eups/distrib/eupspkg.py

@@ -744,7 +744,7 @@ def initServerTree(self, serverDir):
         # Create the tags storage directory
         tagsDir = os.path.join(serverDir, 'tags')
         if not os.path.exists(tagsDir):
-                os.mkdir(tagsDir)
+                os.makedirs(tagsDir, exist_ok=True)
 
 
     def getTaggedReleasePath(self, tag, flavor=None):

python/eups/distrib/pacman.py

@@ -204,7 +204,7 @@ def createPacmanDir(self, pacmanDir):
            pacman -install http://dev.lsstcorp.org/pkgs/pm:LSSTinit
         """
         if not os.path.isdir(pacmanDir):
-            os.mkdir(pacmanDir)
+            os.makedirs(pacmanDir, exist_ok=True)
 
     def cleanPackage(self, product, version, productRoot, location):
         """remove any distribution-specific remnants of a package installation.

python/eups/utils.py

@@ -564,7 +564,7 @@ def createTempDir(path):
             dir = os.path.join(dir, d)
 
             if not os.path.isdir(dir):
-                os.mkdir(dir)
+                os.makedirs(dir, exist_ok=True)
                 os.chmod(dir, 0o777)
 
     return path