Duplicate short option "-a" for git-gc

JBossFuse:karaf@root> git-gc --help
DESCRIPTION
        fabric:git-gc

	Invokes "git gc" command on selected containers

SYNTAX
        fabric:git-gc [options] [container] 

ARGUMENTS
        container
                The container names

OPTIONS
        -a, --all
                Send command to all containers
        -t, --timeout
                Timeout used when waiting for response(s)
                (defaults to 10000)
        -a, --aggressive
                Set "--aggressive" option for "git gc"
        --help
                Display this help message