getZiti should not re-download the binary

[dovholuknf]

right now the helper script ziti-cli-functions.sh provides a getZiti function. If you invoke that function twice from bash the script does not properly detect that the lastest ziti binary has been downloaded:

$ getZiti
using default ZITI_HOME: /home/cd/.ziti/quickstart/
ZITI_BINARIES_VERSION: v0.27.9
Downloading https://github.com/openziti/ziti/releases/download/v0.27.9/ziti-linux-amd64-0.27.9.tar.gz to /home/cd/.ziti/quickstart//ziti-bin/ziti-linux-amd64-0.27.9.tar.gz
UNZIPPING /home/cd/.ziti/quickstart//ziti-bin/ziti-linux-amd64-0.27.9.tar.gz into: /home/cd/.ziti/quickstart//ziti-bin/ziti-v0.27.9
Marking executables at /home/cd/.ziti/quickstart//ziti-bin/ziti-v0.27.9 executable
cd@172.20.166.120:sg3u22: /mnt/v/temp/zssh
$ getZiti yes
ZITI_BINARIES_VERSION: v0.27.9
Using ZITI_BIN_DIR: /home/cd/.ziti/quickstart//ziti-bin/ziti-v0.27.9
Downloading https://github.com/openziti/ziti/releases/download/v0.27.9/ziti-linux-amd64-0.27.9.tar.gz to /home/cd/.ziti/quickstart//ziti-bin/ziti-bin/ziti-linux-amd64-0.27.9.tar.gz
UNZIPPING /home/cd/.ziti/quickstart//ziti-bin/ziti-bin/ziti-linux-amd64-0.27.9.tar.gz into: /home/cd/.ziti/quickstart//ziti-bin/ziti-v0.27.9
mv: cannot overwrite non-directory '/home/cd/.ziti/quickstart//ziti-bin/ziti-v0.27.9/ziti' with directory '/home/cd/.ziti/quickstart//ziti-bin/ziti-bin/ziti'

getZiti should:

• place the binaries into the same known location each time it's run
• notice when $ZITI_HOME or $ZITI_NETWORK is unset (notice the path downloaded: /quickstart//ziti-bin/ and the extra slash in the path
• not download the binary if it already exists at the target location

[plorenz]

Was closed when edge was merge to ziti and a commit comment referencing an edge issue now referenced this issue. Reopening.