only import python module md5 when module hashlib isn't available

$ ack --python "(import.*md5)|(md5.*import)" -C3

scripts/install.py

76-

77-try:

78-    # Python 2.6

79:    from hashlib import md5

80-except ImportError:

81-    # Python 2.5 and earlier

82:    from md5 import new as md5

83-

84-from indra.base import llsd

85-from indra.util import helpformatter

indra/lib/python/indra/base/lluuid.py

30-import uuid

31-try:

32-    # Python 2.6

33:    from hashlib import md5

34-except ImportError:

35-    # Python 2.5 and earlier

36:    from md5 import new as md5

37-

38-def _int2binstr(i,l):

39-    s=''

indra/lib/python/uuid.py

474-

475-def uuid3(namespace, name):

476-    """Generate a UUID from the MD5 hash of a namespace UUID and a name."""

477:    import md5

478-    hash = md5.md5(namespace.bytes + name).digest()

479-    return UUID(bytes=hash[:16], version=3)

480-