Improve immudb tools scriptability

[SimoneLazzaris]

What would you like to be added or enhanced

Immudb tools (immuclient/immuadmin) are sometimes difficult to use in a script: the main focus seems to be interactive use, and often workaround are needed.

Some examples:

• [ ] immuadmin should accept the immudb admin password using an environmental variable. Now the workaround is echo -n password|immuadmin. The -n part is hard to guess
• [ ] with immuadmin is now "impossible" (i.e., very hard) to create a new user inside a script: it ask for password confirmation, which defiles the common echo "password"|immuadmin trick

[mageekguy]

Hi! It should be interesting (at least for me ;)) to merge the according PR ASAP, because I should create some users using Makefile and password confirmation is a PITA in this context.

[emkaminsk]

@SimoneLazzaris is this still an issue?