Authentication failure is now recorded in "QuickBooks_IPP_IntuitAnywhere::test" method

[aik099]

Before this PR, when user attempts to login with expired authentication token, then:

• he/she isn't getting any error back
• the "QuickBooks_IPP_IntuitAnywhere::test" method return true
• next executed command fails, because user isn't authenticated

After this PR, when user attempts to login with expired authentication token, then:

• both error code and error message of CustomersService is recorded and user is able to get them back
• the "QuickBooks_IPP_IntuitAnywhere::test" method return false
• any code using above method will properly react to the error and won't send any new commands to the server

[aik099]

@consolibyte , any updates?