pkgid: add the -p flag as the output suggests
pkgid: add the -p flag as the output suggests

When you use this command and there are multiple packages that match
this spec, the help instructions tell you to rerun it with the -p
argument which was previously not present. Since the code paths are
shared with 'cargo build' and 'cargo update', this adds the -p argument
to 'cargo pkgid' to make things more consistent.

Signed-off-by: Doug Goldstein <8172f793ca553050868d487fd13b508d19cae503@cardoe.com>

rust-lang/cargo,durka/cargo,eminence/cargo,sbeckeriv/cargo,achanda/cargo,achanda/cargo,vojtechkral/cargo,durka/cargo,eminence/cargo,vojtechkral/cargo,eminence/cargo,eminence/cargo,tshepang/cargo,rust-lang/cargo,rustyhorde/cargo,sbeckeriv/cargo,rustyhorde/cargo,tshepang/cargo,tsurai/cargo,tsurai/cargo,durka/cargo,tsurai/cargo,AndiDog/cargo,sbeckeriv/cargo,rustyhorde/cargo,AndiDog/cargo,rust-lang/cargo,rustyhorde/cargo,nipunn1313/cargo,tshepang/cargo,vojtechkral/cargo,tsurai/cargo,nipunn1313/cargo,nipunn1313/cargo,AndiDog/cargo,durka/cargo,AndiDog/cargo,tshepang/cargo,tsurai/cargo,achanda/cargo,nipunn1313/cargo,rust-lang/cargo,vojtechkral/cargo,AndiDog/cargo,achanda/cargo,sbeckeriv/cargo