add bash_completion for tab completion.
Moved do_crowbar_build function into the master build_lib.sh file.
Added replacing function for do_crowbar_build to take control of the build.
Merge pull request #1769 from juddmaltin-dell/pull-req-master-575ab307d489a8ee0f9d84fe6f6374e3e22a59ce

https://github.com/crowbar/crowbar/pull/1769

Merged by devtool for VictorLowther
Merge pull request #1770 from cloudsleuth/pull-req-master-d865aeccd3a1c23df8d3e21ff4ab66859a4845a0

https://github.com/crowbar/crowbar/pull/1770

Merged by devtool for VictorLowther
include comment showing how to create admin node
provide post install guidance