Use podLabels with user defined labels in deployment pod template

[yonatankahana]

PR #72 adds the ability to specify labels for all objects created but it does not allow to control the deployment's pods labels which is sometimes important.
we can't just use nfs-subdir-external-provisioner.labels because it contains version information and will force redeployment every chart upgrade. instead, we will use nfs-subdir-external-provisioner.podLabels which consist of nfs-subdir-external-provisioner.selectorLabels and user defined labels.

Fixes #63
/cc @mkilchhofer
/cc @kmova
/assign @kmova

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In response to this:

PR #72 adds the ability to specify labels for all objects created but it does not allow to control the deployment's pods labels which is sometimes important.
we can't just use nfs-subdir-external-provisioner.labels because it contains version information and will force redeployment every chart upgrade. instead, we will use nfs-subdir-external-provisioner.podLabels which consist of nfs-subdir-external-provisioner.selectorLabels and user defined labels.

Fixes #63
/cc @mkilchhofer
/cc @kmova
/assign @kmova

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[kmova]

/approve
/lgtm

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