support passwords containing comma character

[amather]

Is your feature request related to a problem?/Why is this needed
Currently, at least on Linux, the CSI driver supplies the password as parameter to mount as part of other mount options. since these mount options are separated by comma, a password with comma doesn't work.

from the man page:

password=arg
    specifies the CIFS password. If this option is not given then the environment variable PASSWD is used. 
    If the password is not specified directly or indirectly via an argument to mount, mount.cifs will prompt 
    for a password, unless the guest option is specified.

    Note that a password which contains the delimiter character (i.e. a comma ',') will fail to be parsed  
    correctly on the command line. However, the same password defined in the PASSWD environment variable 
    or via a credentials file (see below) or entered at the password prompt will be read correctly. 

Also, this caused issues in the past:
#358
#248

Describe the solution you'd like in detail
As the man page states, the password should either be provided via PASSWD env var or via credentials file.

Describe alternatives you've considered
Using a different password is our only option at the moment.

Additional context
We've had to ask the customer to change the password, because we use k8s and passwords with commas don't work there.....not good :(

[andyzhangx]

what about this solution: if password contains special char, then use PASSWD env var.
Update:
That requires change in upstream:
https://github.com/kubernetes/mount-utils/blob/2afc4979631ce6c534b6be5e859f7bf492c4c503/mount_linux.go#L184-L185

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@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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/close not-planned

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@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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/close not-planned

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