ALL THE PATCHES UNITED IN THE FOLLOWING

Subject: [PATCH] scripts/ci_build.sh installs dependencies and uses mktemp

CI build requires some commands in order to operate properly and some of these
are checked to be in the executable path but nothing more. This fix the issue
installing them at the beginning of the script.

Previous user or concurrent users may use scripts/ci_build.sh and in
particular root user creates a temporary directory that is not removable by
common users. Using a combination of mktemp and trap on EXIT will solve
all of these problems.

This patch unites the following patches:

- scripts/ci_build.sh installs required commands
- scripts/ci_build.sh virtualenv uses mktemp to avoid conflicts

plus a last minute very important typo correction in the code.

The patch has been sent by elastic mail and went in moderation as
usual, and here in attachment. Best regards, R-