In order to add a generatePassword native function to kubcfg.libsonnet add
the required module to vendor/

The new function is added to kubecfg.libsonnet. It can be used to
generate a password with specific properties.

In order to add an exec native function to kubcfg.libsonnet add
the required module to vendor/

As some symbols can cause trouble (e.g. when these are part of
a JSON string an passed on the command line to some other
tool) the symbols that the password generator will use can be
customized.

The 'exec' native function is added to kubecfg.libsonnet.
It can be used to execute external programs from inside
the jsonnet VM.
This is useful for example to interact with the CLI for
1password to store and retrieve credentials.

In order to implement a native function to create
NT(LM) hashes for passwords update vendor with
new dependency.

The 'ntHashFromPassword' native function is added to kubecfg.libsonnet.
It can be used to calculate the NT(LM) hash for a password.
This is useful when these kinds of hashes need to be created in order
to add them to some initial configurations for applications that
expect this format (e.g. Alfresco DMS).

The jsonnet std library does not include such a function.
It is needed for applications that expect URL encoding style
for base64-encoding.

This commit includes '1password.libsonnet' that builds on the
new features commited before to kubecfg like:
- generatePassword
- execProgram
- ntHashFromPassword
- encodeBase64Url

This library can be used to generate password for secrets.
These password are then stored in a vault in 1Password.
Once the new item containing the secrets is stored in the
1Password vault kubecfg will use these when 'rendering'
the secret resource.

In addition to the library 'secrets.jsonnet' is provided as an
example on how to use the library.

This function will return the plan JSON representation
for an item stored in 1Password.
In contrast the existing method 'getPasswordFrom1Password'
expects an item of type / category 'Password'.
The JSON returned can be processed in any way needed.
This is mainly useful for item created in manually in 1Password.

Adds a new field 'fallback' to generatedPasswords_ field in
OnePasswordSecret that is used when the useFallbackValues
parameter to OnePasswordSecret is set to true.

This is useful for example for local development clusters
like minikube that do not require generated passwords
and storage in 1Password.

Also fixes a comment and changes some formatting.

Run with:
kubecfg show examples/1password/secrets.jsonnet --tla-code=useFallbackValues=true

and

kubecfg show examples/1password/secrets.jsonnet --tla-code=useFallbackValues=false
or
kubecfg show examples/1password/secrets.jsonnet

Add more detail to messages traced in 1password.libsonnet
and use std.format for concatinating strings.

The getItemFrom1Password function now also supports passing
a fallback value in form of an JSON object.

Examples in 'secrets.jsonnet' have been adjustes to showcase this
feature.

Trace messages have been improved.

Error out of execution in case an item cannot be read from 1Password
and useFallbackValue is set to false.