[BUG] Node labels exceeds maximum length limit for long namespace and name

[2sin18]

What is your environment(Kubernetes version, Fluid version, etc.)

Kubernetes version: 1.18
Fluid version: 0.6.0

Describe the bug
Label name and values in Kubernetes has a maximum length limit of 63 characters as request by RFC-1123. However, Fluid adds labels to nodes with long prefix (see below examples), which limits the total length of namespace and name of datasets to 63 - 41 = 22.

data.fluid.io/storage-human-jindo-disk-{namespace}-{name}=1B,
data.fluid.io/storage-human-jindo-total-{namespace}-{name}=1B,
data.fluid.io/storage-jindo-{namespace}-{name}=true,
data.fluid.io/storage-{namespace}-{name}=true,
fluid_exclusive={namespace}_{name},

What you expect to happen:

Reduce length of node label prefix.

How to reproduce it

Create a dataset with namespace and name that exceeds 22 characters.

Additional Information

None.

[cheyang]

fixed by #696