Call "java[c] -version" only once

and print out the full output if error occurs.
Bug: 11672548

(cherry picked from 7b66d366bf5c469130f71d0870424fcd265e0301)

Change-Id: I8e2f2ffa2f28146405273b04667efe3c8d1c03ad
Unset _JAVA_OPTIONS before running "java -version".

Unfortunately the previous approach of grepping out java version before
"head -n 1" clash with the effort of running "java -version" only once.

Change-Id: Ic78719c3bf1a54a45342d74bbbfa8e83bbc1bce1
Merge "Call "java[c] -version" only once" into kitkat
Merge "Unset _JAVA_OPTIONS before running "java -version"." into kitkat