fix(semver): Prerelease number comparison issues

[mattfarina]

In prerelease numbers there was the potential for number comparison
issues. For example, 99 being greater than 103. This is now fixed.

[k8s-reviewable]

This change is 

[sstarcher]

This does not seem to be fixed on the Helm side

I build helm from source as of today and still see the issue. I built semver and tested the comparison and it looks fine on the semver side.

./bin/helm version
Client: &version.Version{SemVer:"v2.5.0-alpha.1", GitCommit:"1261f71faf1aa8b9a127a6e1759fd799a51d9528", GitTreeState:"clean"}
Server: &version.Version{SemVer:"v2.4.2", GitCommit:"82d8e9498d96535cc6787a6a9194a76161d29b4c", GitTreeState:"clean"}

./bin/helm search repo/chart -l
NAME                  	VERSION                                           	DESCRIPTION                               
repo/chart	1.0.0-rc.8                                        	descr
repo/chart	1.0.0-rc.7                                        	descr
repo/chart	1.0.0-rc.6                                        	descr
repo/chart	1.0.0-rc.5                                        	descr
repo/chart	1.0.0-rc.4                                        	descr
repo/chart	1.0.0-rc.3                                        	descr
repo/chart	1.0.0-rc.2                                        	descr
repo/chart	1.0.0-rc.11                                       	descr
repo/chart	1.0.0-rc.10                                       	descr
repo/chart	1.0.0-rc.1                                        	descr

 make clean build VERSION=v2.5.0-alpha.1
GOBIN=/Users/shanestarcher/.go/src/github.com/kubernetes/helm/bin go install  -tags '' -ldflags ' -X k8s.io/helm/pkg/version.Version=v2.5.0-alpha.1 -X k8s.io/helm/pkg/version.GitCommit=1261f71faf1aa8b9a127a6e1759fd799a51d9528 -X k8s.io/helm/pkg/version.GitTreeState=clean' k8s.io/helm/cmd/...

[bacongobbler]

Did you make sure to rm -rf vendor and call make bootstrap again?

[sstarcher]

ahh that's likely my issue as I assume make would either rebuild the vendor or the vendor was commited. I'll rebuild and verify it's likely just a user error.

[sstarcher]

rm -rf vendor && make bootstrap clean build VERSION=v2.5.0-alpha.1
Same results

[bacongobbler]

Works for me on master. I'd look over your local configuration and try again. Something's messed up on your end.

><> helm-dev version --client
Client: &version.Version{SemVer:"v2.5+unreleased", GitCommit:"1261f71faf1aa8b9a127a6e1759fd799a51d9528", GitTreeState:"clean"}
><> helm-dev search --versions local/test
NAME      	VERSION    	DESCRIPTION                
local/test	0.1.0-rc.10	A Helm chart for Kubernetes
local/test	0.1.0-rc.9 	A Helm chart for Kubernetes
local/test	0.1.0-rc.1 	A Helm chart for Kubernetes