reason: since isula-build client file mode is too large(0551),
we decided to remove other's permission(0550) on it.
Beside, we change the public key(isula-build.pub) file
mode to 0400(from 0444), so only the owner of the public
key can read the key.
After this commit, if the non-root user want to use command
login, logout, build with args(http_proxy, https_proxy, etc...),
they need use sudo to temporarily obtain root permission.
Signed-off-by: DCCooper <1866858@gmail.com>
422afc4cfa