PY3: We support python3 now, remove error when python3 detected

Signed-off-by: Noel Power <noel.power@suse.com>
16 jobs for npower-waf2.x-py3-build in 352 minutes and 49 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
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build_ctdb

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build_others

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build_samba

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build_samba_ad_dc

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build_samba_ad_dc_2

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build_samba_ctdb

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build_samba_libs

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build_samba_none_env

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build_samba_nopython

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build_samba_nt4

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build_samba_o3

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build_samba_systemkrb5

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build_samba_xc

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build_samba

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