Imports of testsetup command

PathSynopsis
crypto/randPackage rand implements a cryptographically secure random number generator.
crypto/rsaPackage rsa implements RSA encryption as specified in PKCS #1 and RFC 8017.
crypto/x509Package x509 implements a subset of the X.509 standard.
crypto/x509/pkixPackage pkix contains shared, low level structures used for ASN.1 parsing and serialization of X.509 certificates, CRL and OCSP.
encoding/pemPackage pem implements the PEM data encoding, which originated in Privacy Enhanced Mail.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
math/bigPackage big implements arbitrary-precision arithmetic (big numbers).
netPackage net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets.
osPackage os provides a platform-independent interface to operating system functionality.
timePackage time provides functionality for measuring and displaying time.