Follow-up calls during long processing operations clear password

[DumpySquare]

User indicates scenarios where the extension executes another task/query to the selected device while a long running operation is under way (ie. big as3 declaration post). This can cause the ILX extension to respond with an HTTP/401, but it's not an auth error, but a server error that it's busy and couldn't process the auth.

Need to add more logic in the auth token call to look for more specific errors to auth before clearing password.

https://github.com/DumpySquare/vscode-f5-fast/blob/fd490f356e5d092fd101f7b1212fdfbf4f4b7b34/src/utils/f5Api.ts#L548

HTTP-REQUEST: 192.168.200.131 - GET - /mgmt/shared/appsvcs/task/

• port:443, method:"GET", rejectUnauthorized:false, headers:Object, host:"192.168.200.131", path:"/mgmt/shared/appsvcs/task/"

HTTP-RESPONSE: 401

• status:401
• headers:Object
• body:Object
• code:401
• message:"java.net.ProtocolException: status:503, body:{"code":503,"message":"There is an active asynchronous task executing.","errorStack":[],"apiError":32964609}"
• originalRequestBody:"{"username":"admin","generation":0,"lastUpdateMicros":0}"
• referer:"192.168.200.20"
• restOperationId:30599862
• kind:":resterrorresponse"

HTTP FAILURE: 401 - java.net.ProtocolException: status:503, body:{"code":503,"message":"There is an active asynchronous task executing.","errorStack":[],"apiError":32964609}

[DumpySquare]

This was fixed here:

df02284#diff-6ba41e568d844b52ee686a58552821bfR641