Prepare for release v1.7.13

[joestringer]

Summary of Changes

Minor Changes:

• k8s: Update libraries to v1.17.16 ([v1.7] k8s: Update libraries to v1.17.16 #14444, @christarazi)

Bugfixes:

• routing: Fix route collisions in AWS ENI ([v1.7] routing: Fix route collisions in AWS ENI #14337, @christarazi)
• cilium-cni: Fix error handling for bad netns (Backport PR v1.7 backports 2021-01-20 #14669, Upstream PR cilium-cni: Fix error handling for bad netns #14645, @joestringer)
• clustermesh: Ignore symlink files on fsnotify events (Backport PR v1.7 backports 2021-01-20 #14669, Upstream PR clustermesh: Ignore symlink files on fsnotify events #14565, @tgraf)
• Fix bug where Cilium endpoints are not cleaned up, eventually leading to IP exhaustion despite a small number of endpoints on the node. (Improve pod deletion resiliency #14541, @joestringer)
• Fix bug where Cilium would constantly regenerate endpoints in environments with etcd and Linux 4.15 or below. (Backport PR v1.7 backports 2020-12-17 #14440, Upstream PR ipcache: Use controller.Manager on IPIdentityCache for bpf-garbage-collection #14300, @dctrwatson)
• Fix CIDR rule bug potentially dropping allowed traffic or allowing denied traffic for deny policies (beta feature) when using ExceptCIDRs expressions. (Backport PR v1.7 backports 2021-01-20 #14669, Upstream PR Fix CIDR coalescing issue in ExceptCIDR rule expressions #14516, @jrajahalme)
• Fix possible overflow in values presented in the k8s_event_lag_seconds metric. (Backport PR v1.7 backports 2020-12-17 #14440, Upstream PR pkg/k8s: fix k8s_event_lag_seconds for negative time #14313, @aanm)
• pkg/node: Skip setting MTU on local node routes ([backport 1.7] pkg/node: Skip setting MTU on local node routes #14687, @aditighag)
• policy: Don't nil an empty selectors map. (policy: Don't nil an empty selectors map. #14389, @jrajahalme)
• policy: Track selectors that contribute to MapStateEntries (policy: Track selectors that contribute to MapStateEntries #14368, @jrajahalme)

Misc Changes:

• contrib/release: clarify project number for release process (Backport PR v1.7 backports 2021-01-25 #14727, Upstream PR contrib/release: clarify project number for release process #14684, @aanm)
• Dockerfile: Bump cilium-runtime image (Dockerfile: Bump cilium-runtime image #14757, @joestringer)
• docs: Fix dependency conflict (Backport PR v1.7 backports 2020-12-17 #14440, Upstream PR docs: Fix dependency conflict #14264, @joestringer)
• docker: rebuild cilium-runtime image (docker: rebuild cilium-runtime image #14428, @jibi)