Removed imaging pipelines that were based on the deprecated AWImager.

CEP/Pipeline/recipes/sip/bin/CMakeLists.txt

CEP/Pipeline/recipes/sip/bin/imaging_pipeline.py

CEP/Pipeline/recipes/sip/bin/msss_imager_pipeline.py

CEP/Pipeline/recipes/sip/bin/selfcal_imager_pipeline.py

CEP/Pipeline/recipes/sip/master/imager_awimager.py

CEP/Pipeline/recipes/sip/master/imager_bbs.py

CEP/Pipeline/recipes/sip/master/imager_create_dbs.py

CEP/Pipeline/recipes/sip/master/imager_finalize.py

CEP/Pipeline/recipes/sip/master/imager_prepare.py

CEP/Pipeline/recipes/sip/master/imager_source_finding.py

CEP/Pipeline/recipes/sip/master/selfcal_awimager.py

CEP/Pipeline/recipes/sip/master/selfcal_bbs.py

CEP/Pipeline/recipes/sip/master/selfcal_finalize.py

CEP/Pipeline/recipes/sip/nodes/imager_awimager.py

CEP/Pipeline/recipes/sip/nodes/imager_bbs.py

CEP/Pipeline/recipes/sip/nodes/imager_create_dbs.py

CEP/Pipeline/recipes/sip/nodes/imager_finalize.py

CEP/Pipeline/recipes/sip/nodes/imager_prepare.py

CEP/Pipeline/recipes/sip/nodes/imager_source_finding.py

CEP/Pipeline/recipes/sip/nodes/selfcal_awimager.py