Support specify timeout for Milvus()

[yhmo]

Describe the bug
The Milvus() will wait for 90 seconds if milvus server is not running. The Milvus() call to ping(), the ping() has a parameter "timeout=30", and the GrpcHandler has a member "max_retry", its default value is 3. After 90 seconds, the Milvus() will raise an exception "Fail connecting to server on xxx. Timeout"
This behavior is not friendly to users. Maybe the Milvus() should provide a "timeout" parameter.

Expected behavior
Set timeout for Milvus() so we can write code like this:

try:
    milvus = Milvus(host=SERVER_ADDR, port=SERVER_PORT, timeout=3)
except:
    LOGGER.error("Connect server {} failed.".format(SERVER_ADDR))
    raise

Comment
This issue makes users hard to apply pymilvus in production.

[anitas49]

just curious, if this can be included in version 1.1.x pymilvus? thanks!

[XuanYang-cn]

/assign @XuanYang-cn

[XuanYang-cn]

just curious, if this can be included in version 1.1.x pymilvus? thanks!

@anitas49 Yes, will be in pymilvus v1.1.2

[XuanYang-cn]

pymilvus v1.1.2 released