Fix Python code for warning produced by pylint.
- C1801: Do not use `len(SEQUENCE)` to determine
if a sequence is empty (len-as-condition)
- W0611: Unused import * (unused-import)
- C0411: standard import should be placed before X
(wrong-import-order)
- C0411: third party import X should be placed before X
(wrong-import-order)
- C0412: Imports from package X are not grouped
(ungrouped-imports)
- W0212: Access to a protected member _exit of a
client class (protected-access)
Change-Id: I2c0e8379f962eb2957b428617836867b2e725aeb
Signed-off-by: Karol Latecki <karol.latecki@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/471482
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
2f05fbb6d1