cmd/pprof: add --insecure flag to fetch from https endpoints with self signed certificates

[roberthbailey]

Right now the output looks like:

go tool pprof https://host:port/debug/pprof/profile
Fetching profile from https://host:port/debug/pprof/profile
Please wait... (30s)
http fetch https://host:port/debug/pprof/profile: Get https://host:port/debug/pprof/profile: x509: certificate signed by unknown authority

It would be awesome to be able to pass a --insecure option (like when using curl) so that you don't need to add the self signed certificate to the system's trusted root certificate store to collect profiles.

/cc @bradfitz

[calavera]

FWIW I just submitted a change to fix this issue: https://go-review.googlesource.com/20885

[gopherbot]

CL https://golang.org/cl/20885 mentions this issue.

[gopherbot]

CL https://golang.org/cl/33157 mentions this issue.