[Misc] Fix import error and address nits to make CI happy (#563)

1. Add `vllm_version_is` function to check vllm version.
2. `ensure_kv_transfer_initialized` and `get_kv_transfer_group ` have
been moved to other place in vllm main branch via
3408e47159
, this patch fix the import error.

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

vllm_ascend/utils.py

@@ -18,6 +18,7 @@
 #
 import torch
 import torch_npu  # noqa: F401
+from packaging.version import Version
 from vllm.logger import logger
 
 import vllm_ascend.envs as envs
@@ -83,3 +84,8 @@ def adapt_patch(is_global_patch: bool = False):
         from vllm_ascend.patch import platform  # noqa: F401
     else:
         from vllm_ascend.patch import worker  # noqa: F401
+
+
+def vllm_version_is(version: str):
+    import vllm
+    return Version(vllm.__version__) == Version(version)