Continue various minor enhancements to client code

Removed unnecessary "for" loop in function `get_info_for_client'.

Improved `get_vbox_specific_info()' by added debug logging, a variable MY_VM for clarification and coherence, added checking of existence of the virtual machine at the beginning of the function, and rerranged the structure of the code. Also changed the variable name from TMP_CLIENTS to CLI_CONF, and introduced a new variable STATE to track the state of the two booleans.

Improved `get_android_specific_info()' by removing ANDROID_SYS=$( grep ANDROID_SYS $CLI_CONF | sed 's,ANDROID_SYS=,,g' | sed 's,\",,g'). This is done because ANDROID_SYS is set in the configuration file in the scripts/functions script.