Fix component name validation regex

[Skarlso]

When creating a component, the name validation regex is not strict enough. It needs to validate that the component name is valid in regards to being a DNS and also the fact that it should have a /name and the name is mandatory. For this, regex needs to be adjusted to be more strict, but also keep in mind that trailing // should not be allowed.

ocm create componentarchive test 0.0.1 skarlso test-validation
Error: invalid component info: component.name: Does not match pattern '^[a-z0-9.\-]+[.][a-z]{2,4}/[-a-z0-9/_.]*$'

^[a-z0-9.\-]+[.][a-z]{2,4}/[-a-z0-9/_.]*$

a.c/name - name is required
a.c/ - invalid
a.c/// - also invalid
a.c.c/adf/asdf - valid
a.c/asdf/<non-alphanumeric> - invalid
a.c/asdf/ - invalid ( trailing / )

[Skarlso]

Fixed in #24