EUci fails to run on router becuase of older python version support

It seems that we used in pyuci module that is not available on router.

Traceback (most recent call last):
  File "t.py", line 5, in <module>
    print(uci.get("updater", "autorun", "test", dtype=int, default=0))
  File "/usr/lib/python3.7/site-packages/euci/__init__.py", line 99, in get
  File "/usr/lib/python3.7/site-packages/euci/__init__.py", line 35, in _is_iter
  File "/usr/lib/python3.7/collections/__init__.py", line 55, in __getattr__
AttributeError: module 'collections' has no attribute 'abc'